These SWORKz factory replacement gearbox inserts are designed for the S12-2 and S12-3 2WD buggy platforms. They fit within the transmission case to locate and seat internal gearbox components securely. Sold as a set of two sprue assemblies, each carrying four cup-shaped inserts for a total of eight pieces. Features: Fits S12-2 and S12-3 transmission cases Cup-shaped inserts for secure component seating Set of two sprues with four inserts each 7/7/26 cs