If it has a manual CCU I could use the face plate and switches.....defrost & rear light.

(This is the panel that sits immediately below the vents and has the blue compressor dial and the two switches attached).

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT