I have seen the 311 rim on a 750 ... very nice indeed. There is one guy here in Toronto, Canada (I have blogged) also got the same rim but 20". Very happy of the look on his 535 but he now wants another set (Vossen) for next summer.
See post #12 - 21" 311 rim on 750
http://www.bimmerfest.com/forums/sho...185&highlight=
If you want to consider a 1 summer used set, maybe send him a pm, if interested. He "Topview" is at the bimmerfest.com
http://www.bimmerfest.com/forums/sho...182&highlight=