Inboard Boat Parts

Keep your inboard boat running strong with genuine replacement parts for Mastercraft, Supra, Moomba, and other top performance brands. Whether you own a ski boat, wakeboard boat, or wakesurf boat, WaterSkis.com has the inboard boat parts you need to keep your time on the water uninterrupted.

Explore our curated selection of Mastercraft boat parts, Supra boat parts, Moomba boat parts, and more—sourced from trusted OEMs and aftermarket brands known for quality, compatibility, and long-term durability. Our inventory includes engine components, electrical parts, ballast fittings, and maintenance essentials tailored to inboard boats used for watersports.

Not sure what fits your boat? Use our Boat Part Lookup Tool to match parts by make, model, and year for total confidence. At WaterSkis.com, we’re committed to helping you get back to skiing, surfing, and riding—with gear that performs when it counts.


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  • Indmar Thermostat Gasket Indmar Thermostat Gasket 2 Bolt For 350

    Indmar Thermostat Gasket 2 Bolt For 350

    Indmar
    $5.00
    Indmar Thermostat Gasket This is commonly used on Indmar 350 Thermostat Gasket for GM 5.0 and 5.7 small block engines including the RTP-1, MCX, Assault, Monsoon, and many others. This is a 2 bolt gasket used on the top half of the thermostat housing,...
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    $5.00
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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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  • PCM Raw Water Impeller Ford Only

    PCM Raw Water Impeller Ford Only

    PCM
    $108.99
    PCM Raw Water Impeller Ford Only PCM replacement part which fits MasterCraft Boats with a PCM 351 or 302 Ford engine. Will also fit an almost all PCM/Ford applications. Nothing like an overheated engine to ruin your weekend on the water. It is...
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    $108.99
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  • MasterCraft Spare Tire Cover MasterCraft Spare Tire Cover 2

    MasterCraft Spare Tire Cover

    Regal Connection

    MSRP: $39.99
    $34.99
    MasterCraft Spare Tire Cover Keep your spare tire covered up with the MasterCraft Boats spare tire cover. Available for 14" and 15" wheels.
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    MSRP: $39.99
    $34.99
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  • Indmar LT1 Thermostat Gasket

    Indmar Thermostat Gasket LT1 160 Deg

    Indmar
    $17.99
    Indmar LT1 Thermostat Gasket This MasterCraft Indmar LT-1 Corvette thermostat gasket was an engine option in MasterCraft boats from 1993 to 1999. It is used to seal the 160 degree drilled thermostat. Use the boat part look up below to ensure you are...
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    $17.99
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  • MasterCraft LED Trailer Back Up Light

    MasterCraft Trailer Lights

    MasterCraft
    $44.99
    MasterCraft LED Trailer Back Up Light MasterCraft LED Trailer Back Up Lights will not only outlast the traditional style they are brighter providing a safer driving experience both night and day. In addition, LED lights run very cool making them fully...
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    $44.99
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  • Red 2" Round Reflector for MasterCraft Trailers

    Red 2" Round Reflector for MasterCraft Trailers

    $3.99
    Red 2" Round Reflector for MasterCraft Trailers This is a replacement Red 2" Round Reflector for MasterCraft Trailers. Replace your broken or missing reflector today and keep your trailer visible at night! This part from MasterCraft attaches to your...
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    $3.99
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  • Boat Bling Vinyl Sauce - 1 Quart

    Boat Bling Vinyl Sauce - 1 Quart

    Boat Bling
    $25.99
    Boat Bling Vinyl Sauce Boat Bling Vinyl Sauce is the ultimate interior cleaner and conditioner designed specifically for marine vinyl surfaces. This powerful formula cuts through dirt, sunscreen, oils, and grime while leaving your seats, cushions, and...
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    $25.99
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  • Hose formed "U" for Indmar LT1 Engines

    Hose formed "U" for Indmar LT1 Engines

    $17.99
    Hose formed "U" for Indmar LT1 Engines Formed U hose for Corvette LT-1 engines from Indmar and MasterCraft boats. Fits Indmar LT1 engines- goes from the raw water pump to the thermostat housing. Midwest MasterCraft stocks MasterCraft boat parts. Please...
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    $17.99
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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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  • Boat Buddy Trailer Guide

    Boat Buddy Trailer Guide

    MSRP: $229.99
    $0.00
    The Boat Buddy is no longer being made. The replacement item would be the Ramp N Clamp-Click Here.  
    Qty in Cart: 0
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    MSRP: $229.99
    $0.00
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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 Engine Tune Up Kit (1986-older)

    MasterCraft Engine Tune Up Kit (1986-older)

    MSRP: $114.99
    $102.99
    MasterCraft Engine Tune Up Kit (1986-older) Is your 1986 and older MasterCraft boat not running that well anymore? Give it a tune up with our specifically designed MasterCraft Tune Up Kit. This kit fits all Fits Ford & GM based V8 engines with...
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    MSRP: $114.99
    $102.99
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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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  • Indmar 160 Degree Thermostat Indmar 160 Degree Thermostat

    Indmar 160 Degree Thermostat

    Indmar
    MSRP: $69.99
    $61.99
    Indmar 160 Degree Thermostat Indmar 160 degree thermostat for GM based 5.0 and 5.7 engines. Use the boat part look up below to ensure you are purchasing the correct part for your boat.  
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    MSRP: $69.99
    $61.99
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  • PCM Raw Water Impeller GM 350/454

    PCM Raw Water Impeller GM 350/454

    PCM
    $87.99
    PCM Raw Water Impeller GM 350/454 This impeller for your PCM Marine Engine will keep your boat from overheating by properly circulating water through the block and manifolds. We recommend replacing your engine impeller every 100 hours or annually to...
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    $87.99
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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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Whether you're fixing a small issue or tackling a full-season tune-up, WaterSkis.com is your go-to source for inboard boat parts that match your boat and your lifestyle. We carry trusted parts for MasterCraft, Supra, Moomba, and other leading ski and wakeboard boats—all backed by our expert support. Need help finding the exact part? Use our Boat Part Lookup Tool for a fast, accurate match. And don’t forget to check out related categories like Boat Cleaning Products and Ballast System Parts to complete your setup.