Interesting.
BMWSupply and BMWfans both show the wheel (Style 5) out of production.
Ill go and ask my local BMW dealer if they can get them
They are BBS RC090 wheels I think.
I am desperate for a set of E39 (16 x 7J ET20) style 5 or at a push Style 29 alloys.
4 is ok.
I think these are well out of production. I find lots of 15" and 17" and 8J 7 Series rims but no E39.
Posting on the off chance anyone has some