The cab is not a pickup cab,it has seams running down like the sedans.Looks like somebody shortened up a sedan body to put on it.There were hundreds of those done here during the war to get a better gas ration during the war.The rear window is framed like a Tudor sedan.I don't know if the fenders are T or not,I'm not that familiar with them,but they are not A fenders.It could even be a bunch of A parts stuck on another kind of chassis.You say it has disc wheels,but the pictures don't show if they are small ones,(like a Chevrolet)or bigger ones,like a 1-1/2 ton truck.As James Rogers pointed out,the oil filler is an interesting thing.It's on the wrong side.It has an A head,not B.It looks like a nice solid bunch of parts.The headlight bar looks different too.Need some more pictures.The rear of the cab,full height,not just top or bottom,sides of the engine,suspension,wheels,axles,etc.