Izzy - this diagram from a 1929-57 Chevy Master Parts Book, gives a better/clearer indication of what all goes in that linkage. The spring itself is Parts Group 3.459, Spring, accel. and carb control lever, torsion (7/8" free length - 3-1/2 coils). I couldn't find anything on the web for a spring being offered, if that is all you need. Suggest you put an ad in the
Truck Parts Wanted section of the Swap Meet and pursue the needed parts there.
We can leave this thread here as tech info for you and anyone else needing it.
