8 1/4 rear sure grip wanted

Looking for a 8 1/4 a-body sure grip. Will considering my trade 8 3/4 a-body rear 741 case and housing, small bolt axles. Only running a six 8 1/4 would do for me. Hamilton Ontario.
Why don,t you just put the 8 3/4 in and start searching for a sure-grip centersection?Talk to your friend that has all the rears and buy one from him,with some 3.55 gears?You could even just run the 1 wheel peeler til you find one.U-joints are easy to swap!