I have seen at least 4 different sizes '41-'47 front fenders, including 1/2 ton. I found a set of full width, 1 1/2 ton fenders on a school bus, which have the large wheel cutout but fit a full width axle in a 1 ton 4WD I am putting together. I have seen another pair. I don't know if this is what you have in mind, but they would fit your needs if what you want. Just have to look around.

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.