when using s13 brakes the disc slides over the 120y hub onto the wheel studs. so you get a minor track increase (7mm) due to the thickness of the mounting face of the disc.
i get a tiny bit of friendly rubbage only in the footwell area and only when at full lock. but i run a 5.5inch front rim with 175/55 tyre, 50's would fix this. Or perhaps limiting the turning circle, but that would be uncool.
ive got a 205/50 on 6.5inch rim on the rear.
a 7 inch wheel on the front of a 1200 without major rubbage would be an acheivement to say the least!
im assuming you know the correct way to measure a wheel, cos if youve just
measured the overall width of the rim then id say you probably have 15x6 wheels (a good thing)
but anyway, the beauty of simmons is that you can modify them to suit.
good luck with it
b45's will look mint