According to WIS the diesel models had an unchanged cruise control design in the 124 from 86 on ... meaning it is the old style under the dash above left knee. I should be able to check tomorrow.

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it