max Duster tire size

I think I just found the max tire size you can fit on a Duster if you mini tub it and relocate the leaf springs 3". I went to a Mopar Show in Fremont, California with my son on Sunday.
I noticed a KILLER LOOKING 71 prostreet plum crazy Duster pull in sporting some pretty big meats. So we went and talked to him. He had Mickey Thompson 29 x 15.5 x 15 sportsmans. He said the rims were 15 x 10's but he didn't know the backspace :(
The outer edges of the wheel wells were untouched!
All he did was trim that inner lip, the one that fat tires always rub on when you hit a bump, to about 1/4 to 1/2 inch wide to give the tires some bouncing room. Some people just roll this up.
This car looked Bad ***!
I bet these tires would look killer on an early Cuda. :wink: Are the wheel openings the same size as a Duster, sure look like it?
Too bad I forgot the camera, hopefully he will be at the next one.