[MikeK]

If you are talking original parts and design, I would think the short list would be found within anything that did not move from the VE27's to continued 28 and later "A" production and those mechanical and body/frame parts that saw major change during the transition to the '32 "B" design and specs.

Some items: 1/2" shaft Abel starter drive, block, flywheel housing, and banjo castings without adequate reinforcement ribs, float hinge direction on A Zeniths, wood framed bodies, . . .