I'm trying to install a Kenwood MP8017 headunit into a '01 M3 and I am having trouble finding the adapter plate. I checked with Cartoys and they said that I would need to have one custom made (I think that the M3 has a 5-series unit, which is a different size). Should I be able to use a regular E46 3-Series install kit or is there a place I can find one specifically for an M3? Thanks for any help!