>>Bump<<.

I hate to see these questions unanswered.

Couple questions OP mplsbenzo:

Please tell us where you are geographically. You can update your profile/signature.
It helps a lot. Someone may be closer to you that can help.

Having no specific experience with a 1980 300SD I would ask if that
car has the bowden cable on the valve cover for the trans, if so
then the replacement you mentioned may be a fit.

__________________
80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250