Finding more than a hiway tire for my 1952 one ton dually with 7x18's is nearly impossible. i took a 16" wheel and tire off of my 76 chevy and mounted it right up on the front end..fits great. im wanting to swap rear ends so i can have a wider variety of tire selection. Is there any gm rear end i need to look for. I would like to stay with the narrow(cab and chassis) rear end. Please Help!!!