Just talked to darkcloud... for anyone who buys the part off eBay or at a salvage yard.. the part number for the retrofit cable is 61120434330.
Good luck to everyone doing this! I picked up my mirror off ebay for $70 and it has Auto-Dim, Homelink, Compass, and the slim-line clown nose! The slim-line clown nose alone was worth the $70
Don't pay $500 for this mirror like others on the forums! They are out there for much, much less!