First definitely make sure it's an 8" rear end. An ease way to tell is to look at the bolts that hold the 3rd member in. If you can get a socket on the bottom ones, it's an 8". If the bolts are arranged that you have to use an open ended wrench, it's a 9". From there I'm almost positive I've seen a posi unit in Summit. If not there try Jegs....I know Jegs has gears for 8" rear ends.
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