Try these for the reverse lights(yours are 921 style):
http://www.amazon.com/iJDMTOY-Replac.../dp/B00JK020H2
They work well.
For the license plate I just got generic LEDs. You can get the OEM LED's BMW uses in other cars from what I have read as well.
http://www.zpost.com/forums/showthread.php?t=1121411