Retrofit CIC unit in 07 650i Identify compatible replacements

Question by ericwright posted 3 months 4 weeks ago in 2004-2010 (E63, E64)

My CCC in my '07 650i is Kaput. I want to retrofit a CIC unit. But how do I identify the CIC unit which will work?

I find 323 donors, but I have been told, without great insight, why.