I have a 87 SC with size 15' tires ,and rims. I would like to put the 16' RS rims I have on the car. Do I need spacers to put these on? Will they fit? What will I need to make them fit. If I cant use them I will sell instead.

 

If the rims came off of a thirdgen then they will fit with no problems. they look like they would use spacers because they appear to stick out more, but if you look where the lug nut holes are you can see that they have offsets to make the stick out like that

 

The factory 16" wheels used a thin spacer in the rear (85-87 anyway), but you don't have put them in there. The difference in track width is minimal, and nothing will rub.