This Schumacher Racing Products factory replacement diff input is designed for the Cat PB 4x4 buggy platform. The metal component features a hexagonal body with an integrated flange and retaining prongs that locate it securely within the differential assembly. It is a direct replacement for the original part, restoring proper power transfer through the drivetrain. Features: Metal construction for durability Hex body with integrated mounting flange Retaining prongs for secure differential fitment Direct factory replacement for Cat PB drivetrain 7/7/26 cs