Herer's the hubs and adapters off my C8. The one on the right is the rear wheel adapter. The front ones are the whole hub and not just an adapter. To use the 6 on 5 1/2 wheels on the front you'd have to install a half ton spindlle. I think the king pins are the same.
The problem with civvy wheels would be to get them positioned at the right width for the truck. The adapters are about 3" wide so if you remove them the track width is 6" less. If I was doing this I'd get some machinery rims that use the 7 rib 11x15" tires. These are the same profile as the military tires and are only 1 or 2 inches more diameter. Then I'd cut the centres out and weld in centres off a 6 bolt Chev with the rim offset outwards as far as I could get it. You'd end up with the right shaped tire sitting in the right place and you'd pick up a couple of mph to boot. You could also groove the tires at right angles to the ribs if you wanted the tread.
As for the headlights didn't one of those pictures of the CMP Umbauwagen have the same thing? Maybe there was a supply issue at one time?
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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