1991 and 18's
 

Sorry to post this, but i cant seem to search it, but will a set of 18x7.5 with a 48 offset fit a 1991 Se without rubbing. Thanks.

I think they will rub. My 18x8 with a +45 offset rub, and they clear w/ a 6mm spacer. If you use a 6mm spacer yours should clear as well.

Here is the math I did: 48mm - 6mm (0.25in converted to mm --> this compensates for the narrower width of your wheels) = 42mm, which seems a tad high. My math could be slightly off though.

Unless you meant your actual wheel was rubbing, wheel width usually doesn't matter that much. +48 is still to high unless you run a really skinny tire like 215 or 205, although I don't know off the top of my head if you can even mount a tire that thin on a 7.5" wide wheel.

Best to use spacers. A 15mm spacer would be best and let you run those desirable 235 width tires, but would require you to change your wheel studs.

so 48 is too high, what would be the ideal offset for a 7.5" wide tire, 'cus yea i'd definately like to be able to run 235's.

or better yet, could i put 245's on a 17x8 rim, if so will these rub, and what kind of offset for these.

Most commonly run maximum size is 235/45, but I think people like Jeff have gotten away with 245/45 on his Stang wheels, which are roughly +32. You'd want 35-30mm offset to fit 235's. A 7.5" or 8" wheel will do.

I currently run 235/45 on a 17x7.5 with +35. It rubs the innner plastic fender a little bit on the passenger's side most likely from worn suspension (which I'm fixing now....) and because the actual measured width of my tires is wider than average for 235's.