A pair of like new H&R Trak+ hub-centric 30MM (1 3/16") wheel spacers 5x120, part number 6075725. I used these for less than 100km. These are the German precision made ones and will not
cause vibration. These come with spacers, lugs and original box.
I used these to fit BBS CH 19" fronts (8.5" wide, ET35) on my E46 M3 rear to make the offset match the original offset of the 10" BBS CH rears. You want these if you plan to use non M 17", 18" or 19" rims on an M3 rear for winter. Another example is where you might use 4 M3 fronts all around and want the spacer to create the rear offset (flush fender) look.
This is a great calculator to determine offset. For reference, a flush M3 rear example is the BBS CH rear - 19", 10" wide, 20ET