I think I have figured out the part numbers for the heater control unit. Part number 210 830 3185 is the unit that resembles the xfire unit. Check out the pictures from 97 - 00 Mercedes C Class Climate Heater AC Control LKQ | eBay.

Ther unit with the white dials has a different number.. 170 8300 785. Please advise before i commit to buy! Thanks for all your help. I really appreciate it!