Sea-Doo › Sea-Doo 1503 4-Tec Top End Rebuild Kit (Standard) Image 1 of 1 Sea-Doo 1503 4-Tec Top End Rebuild Kit (Standard) $546.83 Standard bore rebuild kit for 1503 engines. Restores efficiency and reliability. Add To Cart Added! Standard bore rebuild kit for 1503 engines. Restores efficiency and reliability. You Might Also Like Sea-Doo 580 Top End Rebuild Kit (.75mm Over Platinum, 76.75mm) $258.46 Sea-Doo 580 Top End Rebuild Kit (.25mm Over) $238.56 Sea-Doo 580 Top End Rebuild Kit (1mm Over Platinum, 77mm) $258.46 Sea-Doo 1503 4-Tec Top End Rebuild Kit (Standard) $745.71 Sea-Doo 580 Top End Rebuild Kit (.5mm Over, 76.50mm 1992-1996) $180.20