i think 8 inches is the common width on all of them but don't quote me there. I know I have had 3 Jimmy's. One was a 72, a 77, and now I have an 85. I wish I still had the 72 and the 77 but all of them were able to fit 33 inch tires with no alterations and I was offroading a fair amount back when I had the 72 and 77. I did rub a tire on the passenger front on my 77 but the only reason that happened was because I had a dead spring (ran over some road trash and it bent it and my sway bar some. The square body trucks are the ones that have that trim and it is pretty firmly attached to the metal on the wheel well with some self tapper screws, but if you have contact what generally happens is the tire will slightly kiss it right where it (and the wheel well ends) and peel that metal trim back and also bend the edge of the wheel-well just enough to initiate more contact. In a pinich you can beat it inwards some with a BFH and that will help prevent that issue, but likewise you can take a cut off wheel or death wheel and trim it about 1 inch to make the curve more gentle and then the problem is solved. Likewise you can do a 2 inch lift and with 33 inch tires it will be perfect.