For adjusting camber & lower control arm length. 5mm provides about 1 degree of additional negative camber.
Now available and reasonably priced in the following sizes:
All 991 GT3’s come equipped stock with 4mm shims in the rear and have about -1.5 degrees of camber at stock ride height. There is room for up to 10mm of more shims.
Note: Shims are sold individually, but usually used in pairs. If you need a pair of any particular size, be sure to change the quantity to two. This application will ONLY work on the REAR of a 991.