I ordered up some 10mm spacers for the rear from ECS tuning along with a complete stud conversion kit to make it easier to change wheels on the fly and add up to a 10mm or so spacer if needed. The rear of the E30’s always tucks more if you run the same offsets. I have been planning to get these for a while to make the fitment match up front to back, but I really got them for my new rear wheels which are coming in later this month. The wheels specs are now 15×8 +4 front and -4 rear.