The D60 shares a cab with the D15 and D8A, but none of them are that common. If you have all the right hand drive specific bits from the original cab, it would be reasonably straightforward to adapt any left hand drive hard cab from a 1941-47 civilian or military Dodge. ( NOT 39 - 40, different ) Those are much more available but still not common. Not that difficult to get 1.5 ton front fenders, but the D60 ones were cut back oversize to clear bigger wheels.
Vintage Power Wagons in the US can do you lots of small stuff like windscreen seals and door parts. The 236 cu in engine is specifically Canadian, so anything with a length, like head, block, cam, crank, manifolds would just have to get robbed from another 25" long engine. Things like oil pump, distributor, etc, may have some interchange with the US military and civilian trucks.
Very little to be had in the US or Canada. Most of these trucks that survive are in the UK, Europe, Australia or NZ now, and other former Empire / Commonwealth places like Malta.