The rebuild kits are usually listed by ring gear diameter. The old drop out 3rd member Chevy truck axle (1/2 ton) is a 9.375". One place I can suggest for parts, if you can't find them from the flaps or online, is Patricks. They do carry complete (w/bearings) and lite (no bearings, just gaskets and seals) kits. They also have the spanner wrenches and dial indicator sets for setting the pinion depth and backlash.
