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I have a GM 12 bolt, 3.73 from a 71 GMC. The spring pads are narrower than those 12 bolts from 73 and later, but is easy to modify. It has all new brakes, seals, axels, studs, and cover(stock). It will be available in mid june if you can wait. It is located in Sacramento, but may be able to arrange delivery for no charge.