TKR7221 – Differential Ring Gear (40t, ET410, use with TKR7222) Vehicle Compatibility • TKR7221 - Differential Ring Gear (40t, ET410, use with TKR7222) is included with the ET410, ET410.2 and SCT410SL kits and can be used as a replacement part for those vehicles. • This item is not directly compatible with other vehicles as it could have different geometry or require additional parts. Please use the instruction manual from the kit(s) listed above to verify can work with your vehicle before purchasing.Click the links above to view other parts.