Truckasaurus...I had the same issue with my '42...I tried a late '60s Chevy Blazer 3.42 rear (6 lug) but it was 2" too wide...I searched the junk yard for a fit but no luck. I ended up using a 70-72 Nova rear on which I had the lug plates redrilled for 6 lugs (had the odd holes welded in and ground flat). Seems to work fine.