CMP windshield throwout arm assemblies

[Charlie Down]

I've been playing around with the images and drawings.
My initial conclusions are that the 1533X2 had the shorter arms, which is sort of confirmed when I overlaid the images after sizing them.
It looks like the CMP arms were a bit heavier duty than the MCP 1533X2 arms, but seem to have very similar profiles.
Whether the MCP arms were made from thicker gauge metal is hard to see or measure with poor quality 80 year old photographs.