According to Chevrolet Parts List No. 197, dated August 1942, the "deep contour" floor heel plates were used on all Chev CMPs from 8cwt to 60 cwt, 2 and 4 wheel drive, including the gun tractor, before serial number 184-05003. Similarly, the "shallow contour" plates were used on all 2 and 4 wheel drive from 15 to 60 cwt and the gun tractor starting at serial 184-05003. The only difference in models is that the 8 cwt isn't mentioned for the later "shallow contour" plates, possibly because production wasn't planned to go much further (but this is only a guess on my part, when did 8 cwt production end?)
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