I wrote this down months ago in my MB notes folder and couldn't even tell you where it's from or if it's 100% accurate:

"...early 70's Plymouth and Plymouth Grand Fury climate control servo fits 70's -80 116 &123 Mercedes..."

I've never dealt with this infamous Satanic (apparently) device, but maybe someone with more knowledge could hunt down some old NOS parts thru Plymouth (defunct) parts supplier. FWIW

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)