Allows the use of 50400 MW Pro Street Axles without changing the stock housing end. Must have Granada type large Ford ends with 3.150" bearing bore, 3/8" backing plate bolts. 3 9/16" x 2" pattern. Includes retainers, o-rings, Timken® 45mm bearings, lock rings, and seals. Installation - Service instructions can be found on Service Bulletin #0012.