Sizes
The square nuts on a CMP are only used as captive nuts from what I can see in my restoration for securing sheet metal on the cab and body.
They're in 3 sizes from 3/16 for the drivers toeplate to 1/4" for things like securing the windscreens, floor plates and grille to 5/16 for mudguards and holding the front shell.
They are also very well known for seizing and turning in their cages in the most inaccesible places. The others either come out nicely or helpfully shear off, both speeding disassembly and hindering reassembly.
Thread is UNC, or Whitworth.
I found it helpful to have taps and dies in all the sizes to run through them before putting them back together.
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