Hey guys I could use some insight with where to go, and maybe a little schooling with some offset. The truck was put together as a pro-street truck at some point. I like the look, and was shopping for another set of back tires for it. Come to find out BF Goodrich was the only ones that made the size that the truck was built with. I could go to a standard size tire but it really wont fill the fenderwell properly from what I have been reading. The original tire was a traction T/A 345/55/15.

Recently the pro touring look has taken shape, and I must admit that I'm a fan. I think I could probably fit a 19" wheel under the back and probably a 17 or 18 in the front. The front is no issue, the back however...I have no idea. I have a decent amount of offset in the back but I have no idea how to measure it.

Secondly where should I be going to look for wheels? Tire rack used to be my go to, but they are kind of useless in the street rod world.