Is NewMINIStuff the other place selling adaptors? I like the idea of their kits, anyone doing this in the states?

 

I just upgraded the stereo in my '06 MCS two weeks ago. I bought one of the Alpine-to-MINI MFSW adapters. Part of their harness uses a small box that converts the function to a single headphone jack, which plugs into the back of the head unit. The problem was the power connections went from MINI to MINI, and that required me to still splice in the harness that came with my head unit. The other two parts you need are the faceplate bezel to hold it in place, as well as the antenna adapter to convert from MINI to standard.

A logical diagram of my stereo is below. You can check out the setup by going to my garage.