Thank you all for your informative input.
Bottom line is I guess: I should not feel bad about putting another cab on my chassis as I am not overriding any unique or significant history now that we know it wasn't responsible for shooting down 2 Vals and a Zeke while defending the wharf at Darwin ...
There was mention of rifle/bren storage in CMP cabs - can anyone verify the brackets in my replacement cab? (off a C60A)
It has the rifle butt holders on floor but also has what appears to be a horizontal and vertical metal loop and corresponding clamp for perhaps a bren parts bag?
Note sanded part under bonnet looking for numbers