[I'm Redline]

OK, I bought a 95 to use the parts to rebuild my 96 zenki. It came with a set of ICW clones of Gram Light's G-Games in 7x7.5 +42. OE SE's are 6.5 x 16 +40 and sit battle sunk on a normal car.
What size spacers will I need for the front and back to fit these +42's out to the fender lip?
I came here to ask because I *think* 20mm in back and 15mm in front MIGHT work, but n order to buy once and cry not, I defer to the expertise herein. The reason I am using these wheels is they have brand new tires on them and they also have <100 miles on them. They will get me the 4,000 miles while I save up for my Gram Lights and wider tires