The kit you buy depends on what car you have and when it was made. I bought mine from Tischer and when I ordered the part I gave them my VIN and they made sure I received the part for my car. FYI: I own a 2007 328i (01/07 production) and the kit I had installed was 65 11 0 036 446.
2007 328i (01/07 Production)
Blacked out Kidney Grill || Bluetooth Retrofit || Ipod Retrofit || Rear Power Outlets || Euro Switch || Blacklines