If you old enough you can remember that the mustangs had four lugs and many if not all the rim for them will fit our cars, if fact many ford cars had four lug way back in the 80s, plus any rim for the Z&ZX cars will fit ours. When I was down south I saw a few old Zs with Celica GT-S/Supra wheels.
Also wheel spacers are nice, but they are for the look not proformance. Wheel spacer push the rim out so you need longer studs to insure good thread depth, second with longer wheel studs you have a greater chance of bending our break the studs. The simple physics is the longer a bar is the easier it is to bend. Yes I understand that our cars our hub-centeric, and the the lugs only holds the wheel to the hub, but the studs still has a large amount of force to withstand. If the only Rims you find need spacers to fit our cars then get the spacers, but no autoX or any crazy O shit bar cornering and you'll be fine.
Option Our cars look great with a 1 or 2 inch lip on the rims, I personally do not like these high offset rims that you see everywhere weather OEM or aftermarket. My 99 Golf has some nice factory rims(only 14 too small), but with such a high offset and with recessed lugs I can not get the rims off to change the tire now that I lost the key lock, I forgot it came with wheel locks from the factory for a set of 14" rims is that not stupid, now I have to take to the dealership and pay them over a $100 to get the locks removed. sorry for the rant well that my .02cents