I just bought a 10 bolt rear from a guy that was sabout to scrap a 87 blazer, paid 150.00, reason I bought it because it was the exact width for my 51,3100, plus it was six lug ,same pattern as front.most late model rears don't usually go bad .If the rear has oil in it and not two or three hundred thousand miles you should be ok. good luck. old navy 51............................
