After working on Panzer IIIs, Stug, and Panzer IV, Panzer V, and Panzer VI, it seems the models were created by different teams who did not use consistent terminologies.

Panzer IV, V, and VI seems pretty consistent in referring to the torsion spring bars as just torsion bars (or was it torsion springs). However, in Panzer III they are called... "rods"?

Someone may have to go back and revise all the models to make the descriptions / labels more consistent across all models. This is mostly cosmetic so it's probably lower priority.