75 8.25 rear.

I'm in need of a Good condition track lock/ sure grip for my 75 8 1/4 rear going in my 68 dart. Going from 2.71 open to 3.23 . any options open to. Also complete under dash back up light assembly needed. I'm also looking for a radiator to fit my 68 dart with 70 up inlet out lets on it. doesn't matter brass or aluminum /w auto trans cooler. Thanks everbody.:thumrigh::thumrigh: