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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  • Supra Boats Chrome Decal 59" Supra Boats Chrome Decal 59"

    Supra Boats Chrome Decal 59"

    Supra Boats
    $399.99
    Supra Boat Chrome Decal 59" Give your Supra Boat an updated look with the New OEM Chrome Decal. The Chrome decal has raised lettering. This Supra Boats Chrome Decal 59" is used for both the port and starboard sides of the boat. This is also the OEM...
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    $399.99
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  • MasterCraft Courtesy and Glovebox Light MasterCraft Courtesy and Glovebox Light

    MasterCraft Courtesy and Glovebox Light

    MasterCraft
    MSRP: $29.99
    $17.99
    MasterCraft Courtesy and Glovebox Light Replacement interior storage, glove box and courtesy light for MasterCraft boats. This light uses a 2 hole bolt pattern for installation with a chrome beauty cap that covers the top half and mounting holes...
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    MSRP: $29.99
    $17.99
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  • MasterCraft Ignition Ballast Circuit Breaker MasterCraft Circuit Breaker Ignition Ballast

    MasterCraft Circuit Breaker Ignition Ballast

    MasterCraft
    $9.99
    MasterCraft Ignition Ballast Circuit Breaker Genuine MasterCraft boats 20 Amp Ignition and ballast circuit breaker with 90 degree two prong terminals. This marine circuit breaker is ignition protected for use in many marine applications. Features screw...
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    $9.99
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  • Stainless Steel Boat Cupholder Stainless Steel Cupholder

    Stainless Steel Cupholder

    MasterCraft
    $12.99
    Stainless Steel Boat Cupholder These replacement stainless steel cup holders from MasterCraft feature an easy to install drop in design that lends a touch of elegance to your boat. The stainless look complements most interior boat upholstery themes...
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    $12.99
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  • MasterCraft Boats Flexor Chrome Transom Decal

    MasterCraft Boats Flexor Chrome Transom Decal

    MasterCraft

    $249.99
    MasterCraft Boats Transom Decal MasterCraft OEM transom decal for most X-Series boats (without cut through "r"). Standard on X-Stars, X-1, 2004-2006 X-2, X-10 and X-30. Approximate size: 3" tall by 29" long Use the boat part look up below to ensure you...
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  • MasterCraft Muffler | TBI VRS - Muffler Only

    MasterCraft Muffler | TBI VRS - Muffler Only

    MasterCraft
    $1,399.99
    MasterCraft Muffler | TBI VRS - Muffler Only This is a genuine replacement fiberglass muffler kit for many MasterCraft V-drive boats with the standard 350 engine with a throttle body intake. This muffler was typically used in V-Drive boats made from 1999...
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    $1,399.99
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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
    $506.00
    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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    $506.00
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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
    $599.99
    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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    $599.99
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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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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.