Why do you want to SAS it? The only axles that have that pad width are Ford axles 78-79 and Chevy D60s. The Fords are driver side diff an are high pinion. The Chevys are passenger side drop low pinion. That will require you to get a new transfer case. Wether or not you really need a high pinion depends on why you want to SAS it. Is it a Duramax/Ally? Or a 6L/80E? or an 8.l/Ally?