If you're keeping the original six lug pattern a mid 90s Isuzu Rodeo rear end will work.
The Isuzu Rodeos were fitted with a Dana 44 rear end so parts will be easy to get on your side of the pond. It's 58" wide wheel mounting face to wheel mounting face and has the spring perches in the right place for a 36. The rear end has disc brakes too, lots of them have a Posi diff as well. I am fitting one of these to my brother's '36 low cab 1/2 ton truck at the moment.
Stuart.
Last edited by Stuart_Giles; 08/18/2009 11:10 AM. Reason: typo