All of the trucks in the photos are 1940, according to grille and fender lights. There were no long bed 1/2 ton Chevy pickups before 1955 2nd series. There were long bed 1/2 ton GMC Trucks earlier but I am not sure when.
What appears to be a long bed 1/2 ton Chevy, starting in 1937 and continuing through 1941 ('42?) is a 3/4 or one ton. These trucks had 6 hole wheels and a 10" longer wheelbase than their 1/2 ton siblings. The 3/4 tons came with 15" artillery wheels and the 1 tons came with 17" snap ring wheels to clear the 14" rear brakes.
New steel reproduction fenders are available for '40 through '46 pickups for around $1,000 each.
FYI, 1939 rear fenders are different in that they are about 1-1/2 inches wider that the later fender. '39 and '40 front fenders are the same and fit 1/2, 3/4, and 1 ton models. All of the trucks in the photos are wearing their proper front fenders.
Mike
Last edited by 35mike; 05/21/2021 2:05 PM.