Yukon supplies this crush sleeve sized at approximately 0.480" long for a range of applications including AMC Model 20, Ford 10.25" and 10.5", Ford 7.5" and 8.8", and several 9" variants. It is intended as a direct replacement sleeve for those axle models and restores correct pinion spacing during reassembly. The part is part of Yukon’s broad differential small-parts offering.
Yukon Gear Crush Sleeve