Master Differential Install Kit GM 8.5 in. Rear For GM. MODEL PRODUCT NOTES: Fits Eaton part number(s): 187C149A, 187C148A, 912A556, 913A481, 19557-010, 19559-010, 19659-010. Fits Eaton part number(s): 187C149A, 187C148A, 912A556, 913A481, 19557-010, 19559-010, 19659-010.
