LDO you can use 60-66 chevy rears, also at 62 inches they are 6 lug, 308 and 342 are out there but a little rarer, `67 and I think `68 also used 6 lug but 63 inch wide, which should still fit, 308 /342 a lot more common, either of these will require the mounts cut off and spring perches welded on, or you may look into the late model 6 lug which will work, same with the spring perches, might have to have the center hub turned down to get wheels over the center wheel indexer.