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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  • Supra | Moomba Strut - 15 deg. 1" | 082

    Supra | Moomba Strut - 15 deg. 1" | 082

    Skiers Choice
    $409.99
    Supra | Moomba Strut-15 Degree 1" | 082 This is a 15 Degree Strut for a 1" shaft for Supra and Moomba Boats. Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and Moomba Boat.  
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    $409.99
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  • Supra | Moomba Rudder Assembly | 072

    Supra | Moomba Rudder Assembly | 072

    Skiers Choice
    $899.99
    Supra | Moomba Rudder Assembly | 072 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. This is the New 105 Degree, No Tuning Bar rudder assembly. Use the Boat Part Lookup to ensure you are getting the correct part for your...
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    $899.99
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  • Supra | Moomba Rudder Assembly | 203

    Supra | Moomba Rudder Assembly | 203

    Skiers Choice
    $649.99
    Supra | Moomba Rudder Assembly | 203 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. This is the 105 Degree rudder assembly. Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and Moomba Boat...
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    $649.99
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  • Supra | Moomba Rudder Assembly | 426

    Supra | Moomba Rudder Assembly | 426

    Skiers Choice
    $799.99
    Supra | Moomba Rudder Assembly | 426 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. This was used on many v-drive Supra Boats and Moomba Boats. Use the Boat Part Lookup to ensure you are getting the correct part for your...
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    $799.99
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  • Supra | Moomba Rudder Assembly | 425

    Supra | Moomba Rudder Assembly | 425

    Skiers Choice
    $799.99
    Supra | Moomba Rudder Assembly | 425 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. This was used on many direct drive Supra Boats and Moomba Boats. Use the Boat Part Lookup to ensure you are getting the correct part for...
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    $799.99
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  • 10" Supra | Moomba Tracking Fin (Long)

    Supra | Moomba 10" Tracking Fin | 128

    Skiers Choice
    $359.99
    10" Supra | Moomba Tracking Fin (Long) If you got yourself into a shallow spot on the lake and bent your tracking fin this is a OEM Supra and Moomba Replacement. Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and...
    Qty in Cart: 0
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    $359.99
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  • Supra | Moomba Tracking Fin

    Supra | Moomba Tracking Fin | 820

    Skiers Choice
    $174.99
    Supra | Moomba Tracking Fin If you got yourself into a shallow spot on the lake and bent your tracking fin this is a OEM Supra and Moomba Tracking Fin Replacement. Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and...
    Qty in Cart: 0
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    $174.99
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  • Supra | Moomba 10" Tracking Fin | 226

    Skiers Choice
    $244.99
    10" Supra | Moomba Tracking Fin If you got yourself into a shallow spot on the lake and bent your tracking fin this is a OEM Supra and Moomba Replacement. Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and Moomba...
    Qty in Cart: 0
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    $244.99
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  • Supra | Moomba 7" Tracking Fin | 225

    Skiers Choice
    $187.99
    7" Supra | Moomba Tracking Fin If you got yourself into a shallow spot on the lake and bent your tracking fin this is a OEM Supra and Moomba Replacement. Use the Boat Part Lookup to ensure you are getting the correct part for your Supra and Moomba Boat...
    Qty in Cart: 0
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    $187.99
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  • Supra | Moomba Dripless Drive Shaft Seal 1-1/8"

    Supra | Moomba Dripless Shaft Seal 1-1/8"

    Skiers Choice
    $209.99
    Supra, Moomba Dripless Drive Shaft Seal - 1-1/8" Shaft If the dripless shaft seal on your Moomba or Supra boat has failed, get it repaired before you ruin your shaft. Use the boat part look up below to ensure you are purchasing the correct part for your...
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    $209.99
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  • Shaft Stuffing Box - 1-1/8" Shaft

    Shaft Stuffing Box - 1-1/8" Shaft

    Skiers Choice
    $334.99
    Shaft Stuffing Box - 1-1/8" Shaft If you shaft packing and stuffing box are leaking beyond repair here is your solution. Use the boat part look up below to ensure you are purchasing the correct part for your boat.  
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    $334.99
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  • Shaft Stuffing Box - 1" Shaft

    Shaft Stuffing Box - 1" Shaft

    Skiers Choice
    $349.99
    Shaft Stuffing Box - 1" Shaft If you shaft packing and stuffing box are leaking beyond repair here is your solution. Use the boat part look up below to ensure you are purchasing the correct part for your boat.  
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    $349.99
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  • 20' Steering Cable

    20' Steering Cable

    Skiers Choice
    $299.99
    20' Steering Cable When the steering on your boat gets stiff it's time to replace the steering cable. This 20' Steering cable is a direct replacement for many Supra and Moomba boats. A new steering cable helps keep your boat operating in peak performance...
    Qty in Cart: 0
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    $299.99
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  • 6 Ballast Port Relay Box

    Skiers Choice
    $484.99
    Moomba 6 Ballast Port Relay Box Ballast pumps not turning on? Your ballast relay box may have failed. This is the OEM replacement for a 6 Ballast Pump System.   Use the boat part look up below to ensure you are purchasing the correct part for your...
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    $484.99
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  • 6 Ballast Starboard Relay Box

    Skiers Choice
    $349.99
    Moomba 6 Ballast Starboard Relay Box Ballast pumps not turning on? Your ballast relay box may have failed. This is the OEM replacement for a 6 Ballast Pump System.   Use the boat part look up below to ensure you are purchasing the correct part for...
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    $349.99
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  • 6 Ballast Forward Relay Box

    Skiers Choice
    $399.99
    Moomba 6 Ballast Forward Relay Box Ballast pumps not turning on? Your ballast relay box may have failed. This is the OEM replacement for a 6 Ballast Pump System.   Use the boat part look up below to ensure you are purchasing the correct part for your...
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    $399.99
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  • Supra and Moomba Sahara 750 Bilge Pump

    Sahara 750 Bilge Pump

    Skiers Choice
    $0.00
    Supra and Moomba Sahara 750 Bilge Pump This bilge pump has been discontinued and superseded to this bilge pump - Rule 800 GPH Bilge Pump Please use the boat part look up below to ensure you have the correct part for your year, make, and model.  
    Qty in Cart: 0
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    $0.00
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  • Moomba and Supra Sahara Bilge Pump

    Moomba and Supra Sahara Bilge Pump

    Skiers Choice
    $0.00
    Moomba and Supra Sahara Bilge Pump This bilge pump has been discontinued and superseded to this bilge pump - Rule 800 GPH Bilge Pump Please use the boat part look up below to ensure you have the correct part for your year, make, and model.  
    Qty in Cart: 0
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    $0.00
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  • Lenco Actuator - 5-Lobe

    Lenco Actuator (5-Lobe)

    Skiers Choice
    $524.99
    Lenco Actuator (5-Lobe) This is the OEM replacement Lenco Actuator for Moomba and Supra Boats. Get your surf system back up and running with a new actuator. Please use the boat part look up below to ensure you have the correct part for your year, make,...
    Qty in Cart: 0
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    $524.99
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  • Supra & Moomba Paddlewheel, Sender - Air-Mar

    Paddlewheel, Sender

    Skiers Choice
    $199.99
    Supra & Moomba Paddlewheel, Sender - Air-Mar This is the OEM Air-Mar Paddlewheel replacement for Moomba and Supra Boats. Please use the boat part look up below to ensure you have the correct part for your year, make, and model.  
    Qty in Cart: 0
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    $199.99
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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.