I just got a set of 5zigen SC3000: Fronts: 19", 8.5", +38 and Rears: 19", 9.5", +45.

I already have spacers in the rear but now I need to get front spacers/adapters.

What size spacer/adapter would you guys recommend?

Thanks in advance!

 

measure from the sidewall to the inner fender

 

What he said. It depends on how "flush" you want your wheels, and it also depends on the size of the tire you are running. Just measure it up and go from there.