It seems to me that I remember that the shafts have a "double D" shape and that the levers have the female to that shape. That would mean they can be rotated 180, Sure they may have to be bent or modified but the female portion can be reused if a new lever is designed. This would reverse the action of said shaft relative to said linkage. Maybe that would work, not sure.
They're actually splined, with a notch on one the side opposite for the pinch bolt. The Truck version for '55 6 cylinder is opposite from the Passenger and V8 truck.
