Charlie,
After work today (approx 5 hours from now), I will post some images from the 1543X2 Parts list (unfortunately no diagrams) regarding seats. It appears that in 1941, all 1543X2 production switched from Bench seat to the DND (CMP Type) seats. Rifle racks were added at the same time. I think it is a safe bet that the same parts were used on the 1533X2.
I have not looked at the linked M6 Bomb truck manuals, but we may be able to compare part numbers between Canadian and US production.
Colin
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