Found an expired auction listing for a Ford Motor Co of Canada Shop Manual / Maintenance Manual, for
Conventional and
Modified Conventional Vehicles. This is the First Edition of manual SE-29-C and was issued February 1946.
This has a list plus some pictures of the models described in the manual. This is a nice addition to the
thread Ford Model designation
Shown here are a 1941 Ford Fordor C11A sedan and a 1942 Ford Fordor C21AS Staff Car. You can see the C11A is a Conventional vehicle, with just light alterations from a civilian vehicle. Ian McCallum noted: "Modified sedans started with the 39 model. I have a '40 01A(F). Changes included hide seats, fabrikoid interior plus military fitments and extra instrumentation." The manual noted it had a "grille guard on front bumper".
The "S" in C21AS denotes Special, it clearly has more modifications including heavier bumpers and a roof rack. It looks like the mudguards / wings are cut-back and it has a raised suspension?