Ok i'm about to get a pair of rim/slick combo, but i have no idea what the backspace needs to be. It's a 15x8 wheel and they have two different back spacings available. 2in and 4.25in. Which of these will work with my 92 si?

 

anybody know which will fit??

 

The stock 15x6.5 wheels have a +55mm offset. Do some math.