http://www.realoem.com/bmw/enUS/part...20Racing&mg=11
you will need following parts:
01 Suction pump 1 11417846385
02 Drive Shaft 1 11417848466
05 Cover lid FOR RETURN LINE 1 11418335879
01 Oil pump 1 11418011851
02 Suction pipe 1 11417846384
01 Oil Pan 1 11137854463
I bought used oil pan, suction pump and oil pump from M4. Also you need cover lid FOR RETURN LINE that you can order from the dealer. That part is used on M235R racing version. All those parts exactly the same as M235R cup, so you don't need to make modifications to retrofit them. Right now I have no problem with the engine so far.