OK. Just to be clear:
1. The hybrid and race plates are
not compatible with stock E9x M3 struts and springs. The plates will work with selective aftermarket struts using race springs.
2. GC
does make a hybrid plate option for E9x M3 (this is what I have), but it is not listed on their site. Look at the hybrid plate for E36 as a reference.
3. On GC's web site, there is a product called "BMW E90 Street Camber Plates", and it has "stock" spring as a choice.
http://www.ground-control-store.com/...ion.php/II=842
This is why I thought that it was compatible with stock E9x M3 stock strut and springs. But per people's info above, looks like it will
not work with E9x M3 struts and springs. Perhaps only with regular 3ers?