Whiteline Differential Mount In Cradle + Support Outrigger Inserts Subaru BRZ / Scion FR-S (KDT925) kit contains inserts for both cradle & support outrigger. Fix annoying differential movement and noises while ensuring appropriate differential pinion angles for maximising power transfer to the wheels. Inserts are a cost effective upgrade, if you are looking for a stiffer press in solution, consider KDT924 in combination with KDT923.