Inboard Boat Parts

Get the performance and reliability your inboard boat demands with premium replacement parts from WaterSkis.com. Whether you’re maintaining a MasterCraft, Supra, or Moomba boat, we offer a wide selection of genuine and OEM-compatible inboard boat parts to keep your engine, drivetrain, and cooling systems running strong.

From impellers and ignition components to thermostats and transmission parts, every item in this category is curated for quality, compatibility, and long-lasting performance. Not sure where to start? Use our Boat Part Lookup Tool to instantly find the exact part you need for your specific make, model, and engine configuration.

At WaterSkis.com, we know your time on the water matters. That’s why we make it easy to find the right boat parts—fast, accurate, and backed by real-world expertise.


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  • Rudder Key 1/4" x 3/4"

    Rudder Key 1/4" x 3/4"

    MSRP: $9.99
    $8.99
    Rudder Key 1/4" x 3/4" Rudder Key 1/4" x 3/4" Replacing your cotter pin is cheap insurance and should never be overlooked. This is too important of a piece to be with out and letŒÍs face it, there is no way to look cool while stranded on the lake. This...
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    MSRP: $9.99
    $8.99
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  • Roswell Elite Dual Surf Rack 1 Roswell Elite Dual Surf Rack 2

    Roswell Elite Dual Surf Rack

    Roswell
    MSRP: $451.00
    $410.00
    Roswell Elite Dual Surf Rack With wake surfing growing as much as it is, it would be great if there was a rack that would hold two surfboards! Behold the Roswell Elite Dual Surf Rack! The tried and true Roswell webbed bungee will keep the boards held...
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    MSRP: $451.00
    $410.00
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  • MasterCraft Gas Shock Motor Box and Engine Cover #70

    MasterCraft Gas Shock Motor Box and Engine Cover #70

    MSRP: $29.99
    $24.99
    MasterCraft Gas Shock Motor Box and Engine Cover  Gas strut from MasterCraft Boats used on many MasterCraft boats motorbox and engine covers. This gas shock is designed to hold up the engine dog house and is a direct factory replacement to old worn...
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    MSRP: $29.99
    $24.99
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  • MasterCraft Muffler | 3.5" Inlet/Outlet - Vertical Stbd MasterCraft Muffler | 3.5" Inlet/Outlet - Vertical Stbd

    MasterCraft Muffler | 3.5" Inlet/Outlet - Vertical Stbd

    MasterCraft
    $649.99
    MasterCraft Muffler | 3.5" Inlet/Outlet - Vertical Stbd This is a genuine replacement fiberglass muffler for many MasterCraft boats. This is a single muffler for the Starboard Side of the boat on boats outfitted with a port and starboard side muffler...
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    $649.99
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  • Gas Shock 60# Sundeck

    Gas Shock 60# Sundeck

    MasterCraft
    MSRP: $19.99
    $14.99
    Gas Shock 60# Sundeck Gas strut from MasterCraft Boats used on many MasterCraft boats motorbox and engine covers as well as observers seats. This gas shock is designed to hold up the motorbox cover on your boat. This gas shock has 60lbs of pressure and...
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    MSRP: $19.99
    $14.99
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  • MasterCraft Muffler | 3.5" In w/40° Angle - 3.5" Outlet MasterCraft Muffler | 3.5" In w/40° Angle - 3.5" Outlet

    MasterCraft Muffler | 3.5" In w/40° Angle - 3.5" Outlet

    MasterCraft
    $564.99
    MasterCraft Muffler | 3.5" In w/40° Angle - 3.5" Outlet This is a genuine replacement fiberglass muffler for many MasterCraft boats. This muffler was typically used in direct drive boats made from 2000 to 2006 and features a 3.5" in and out with an...
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    $564.99
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  • MasterCraft OEM Rudder- 178 MasterCraft OEM Rudder- 178

    MasterCraft OEM Rudder - 178

    MasterCraft

    $579.99
    MasterCraft OEM Rudder- 178 This genuine MasterCraft OEM Rudder is model specific. If you have damaged your rudder it is typical that your Rudder Port is also damaged along with other Under Water Gear. Use the Parts Finder to select your year make and...
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    $579.99
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  • Steering Hook Up Kit MasterCraft

    Steering Hook Up Kit MasterCraft

    MasterCraft
    $272.98
    Steering Hook Up Kit For MasterCraft Boat This is a genuine replacement MasterCraft steering hook up kit. This kit was used on all models of MasterCraft (excluding those with hydraulic steering) built from 1979 to 2012. Use the boat part look up below to...
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    $272.98
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  • 21' MasterCraft Steering Cable

    21' Steering Cable

    MasterCraft

    $259.99
    21' MasterCraft Steering Cable When the steering on your boat gets stiff it's time to replace the steering cable. This 21' Steering cable is a direct replacement for Many MasterCraft boats.. A new steering cable helps keep your boat operating in peak...
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    $259.99
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  • Black Cupholder

    Black Cupholder

    MasterCraft
    MSRP: $4.99
    $2.99
    Black Cupholder These replacement MasterCraft cupholders feature an easy to install drop in design. Black color matches most interior boat upholstery. These cupholders work in most boats including Malibu, Moomba, Supra and more. Dress up your boats...
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    MSRP: $4.99
    $2.99
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  • MasterCraft 2 Position Rocker Switch MasterCraft 2 Position Rocker Switch

    MasterCraft 2 Position Rocker Switch

    MasterCraft
    $19.99
    MasterCraft 2 Position Rocker Switch Replace your worn or faded MasterCraft dash switches with this 2 position rocker switch. Features ON-OFF capabilities. Easy installation and an exact fit. This switch has 2 positions and uses a 4 prong set up. This...
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    $19.99
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  • Tower Navigation Light Lens Cap Tower Navigation Light Lens Cap

    Navigation Light Lens Cap

    MasterCraft

    MSRP: $19.99
    $14.99
    MasterCraft Tower Navigation Light Cap Replacement MasterCraft Tower Navigation Light Lens Cap for use on MasterCraft towers.  No matter what the reason you tell your buddies as to why the lens cap is missing you need to replace it. This is an exact...
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    MSRP: $19.99
    $14.99
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  • MasterCraft Bow Navigation Light Bow Navigation Light

    Bow Navigation Light

    $69.99
    MasterCraft Bow Navigation Light Replacement MasterCraft Bow Navigation Light for use on most MasterCraft boats from 1968 to 2006. This bow marker light features a green and red display for viability at night and a chrome cover for rugged good looks and...
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    $69.99
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  • MasterCraft Circuit Breaker 20 Amp

    MasterCraft Circuit Breaker 20 Amp

    MasterCraft
    MSRP: $19.99
    $16.99
    MasterCraft 20 Amp Circuit Breaker Genuine MasterCraft boats 20 Amp circuit breaker. This marine circuit breaker is ignition protected for use in many marine applications. Features screw top installation with a two prong input. Midwest MasterCraft...
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    MSRP: $19.99
    $16.99
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  • MasterCraft Toggle Switch Red LED 3 Position 8 Prong MasterCraft Toggle Switch Red LED 3 Position 8 Prong

    MasterCraft Toggle Switch Red LED 3 Position 8 Prong

    MasterCraft

    $41.99
    MasterCraft Toggle Switch Red LED 3 Position 8 Prong MasterCraft Toggle Switch with red LED. This is a 3 position MasterCraft switch with 8 prongs used where a 3 position (ON/OFF/ON) switch is required such as 2006 MasterCraft ballast, navigation and...
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    $41.99
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  • MasterCraft Muffler | 3.5" In w/30° Angle - 3.5" Out w/80° Angle -Vertical MasterCraft Muffler | 3.5" In w/30° Angle - 3.5" Out w/80° Angle -Vertical

    MasterCraft Muffler | 3.5" In w/30° Angle - 3.5" Out w/80° Angle -Vertical

    MasterCraft
    $599.99
    MasterCraft Muffler | 3.5" In w/30° Angle - 3.5" out w/80° Angle - Vertical This is a genuine replacement fiberglass muffler for many MasterCraft boats. This muffler was typically used in V-drive boats made from 2009 to 2011 and features a 3.5"...
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    $599.99
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  • Gas Shock 30# Sun Deck and Engine Cover

    Gas Shock 30# Sun Deck and Engine Cover

    MasterCraft

    MSRP: $19.99
    $12.99
    Gas Shock 30lb Sun Deck and Engine Cover Gas shock from MasterCraft Boats used on several MasterCraft boats for the Sun Deck, and on many boats from 1991-1997 for the Engine Cover. This gas shock has 30lbs of pressure and measures 20" in length.This...
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    MSRP: $19.99
    $12.99
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  • MasterCraft Exhaust Flap Retainer

    MasterCraft Exhaust Flap Retainer

    MasterCraft
    $23.99
    Exhaust Flap Retainer This is a Exhaust Flap Retainer. This retainer is designed to fit a 3.5" Exhaust Flap. Use the boat part look up below to ensure you are purchasing the correct part for your boat.  
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    $23.99
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  • MasterCraft Rear Storage Bin Rear Storage Bin

    Rear Storage Bin

    MasterCraft
    $199.99
    MasterCraft Rear Storage Bin This is a MasterCraft factory replacement plastic storage bin normally found under the rear center seat of many older MasterCraft boats. This is a molded plastic storage bin sometimes referred to as a cooler. the Upper "lip"...
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    $199.99
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  • MasterCraft MMDC Box Mini M2

    MasterCraft MMDC Box Mini M2

    $3,999.99
    MasterCraft MMDC Box Mini M2 '07 Gauges not working after the winter or a cold snap? Your MMDC box is most likely the problem. Replace your MasterCraft MMDC Box and get everything back to working! This is an OEM MasterCraft specific part. ***Installed...
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    $3,999.99
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At WaterSkis.com, we combine deep product knowledge with industry-leading tools to help boat owners find the exact inboard boat parts they need. Whether you're working on a MasterCraft, Supra, or Moomba, our parts deliver the fit and reliability you can trust.

Use our Boat Part Lookup Tool to simplify your search, or explore related categories like cooling systems, engine components, and ignition parts. We’ve got everything you need to keep your boat running at its best.