18" wheels

What's the front wheel and tire size of this convert? I've got a similar 67 and want to do 17's in the front and 18's in the back but really don't want to do any modifications to make them fit. Did you have any fitment problems at all?
Fronts are 17x8 4.5 back space 225/45R17 tire no fitment problems or mods done on the front or rear