Ok, sorry I must be missing something here. What offset did he say these things were?+20 or +30?
I had a quick squiz on the net, and could only findthose wheels in a 20x8.5 114.3 in a +35 offest. With a 120 PDC they come in a +20 or +40. Not saying there aren't more options, but thats all i could quickly find.
So, with a 20x8.5 +35, you will have 11mm less on the inner, and extend 1mm further out. No need for rolling or anything if it clears on the inside.
I'm sorry if i'm barking up the wrong tree, its late, but I just don't want him to be thinking he's going to be rolling guards/shaving wheels...