Tony the AWM photo shows a Canadian built Chevrolet and not the normal Holden bodied Chev as shown in Jims photos.
Jim it is a 1941 model. Holden bodied by the cowl side vents and quarter lite windows in the doors. It also differed in the mould line across the doors. Holden bodied ones were 'set in' Canadian and US models were like the GMC-CCKW and placed on the door skin.
These were availiable in 1 ton, 1.5 ton and 3 ton loading capacity.
The mudguards had differing degrees of cut outs and as Max said it was done to clear the 18in wheels the AIF used but also on the smaller models it may have been done to save steel. Another reason for the cut outs was to reduce mud buildup under the mudguards.
Hope this helps
cheers
Cliff
