Hmm ok regarding socket contact size:
Thats from the official retrofit guide that toto kindly posted.
So here are the part numbers I think we should be looking at?? (from
http://realoem.com/bmw/showparts.do?...=61&fg=15&hl=1)
For Pin #5 (Bi-Xenon Shutter)
08 Socket contact ELO-Power 2,8x0,63 0,35-0,5 MM˛ 61138377162
10 Rubber grommet ELO-Power 2,8x0,63 0,35-1,0MM˛ 61138369722
For Pin #2 (New ground wire)
08 Socket contact ELO-Power 2,8x0,63 1,5-2,5 MM˛ 61138364834
08 Socket contact ELO-Power 2,8x0,63 1,5-2,5 MM˛ 61138369634
08 Socket contact ELO-Power 5,2x0,63 1,5-2,5 MM˛ 61138369642
10 Sealing grommet ELO-Power 5,2x0,63 1,0- 2,5 MM˛ 61138372628
So it's probably one of those, but maybe just order all to be safe??