they're not hard to find! most if not all early-late 70s 2wds had a 5 lug, 8" rear end with 4.10 or 4.38 gears.

most 4 speed 2wds after that seemed to have a 3.08 8" rear end with 5 lugs as well

'79 sport 4x4 longbed <img src="/forums/images/graemlins/smile.gif" alt="" />
20/22R hybrid with EB's OS valves, 268c cam, offy intake, weber 32/36, thorley header, 5 speed swap, 34" LTBs, downey 3" springs, marlin hysteer, 4.88s and locked

'91 4x4 shortbed
22R-E, W56, the dd!