I agree that it doesn't look correct.

I would call the business, that you bought them from, and ask your question(s). Jim Carter sells the LGL108.
Apparently LGL108 kit includes both 12 and 6 volt bulbs so hopefully the manufacturer of the kit would have done their homework on the AWG.
The original 1939 Chevy truck headlamp bulb was a GE 2330 32CP with a RP-11 bulb socket (please verify) and will not fit these reflectors.

My GUESS, from the pictures, is that the LGL108 is using BAY15D style bulb sockets and more modern bulbs.
You can take your reflectors to your FLAPS and compare their sockets with yours.
Maybe you can find something closer to the original AWG.

A short piece of wire 16-18 wire will not have that much voltage drop.
I'm concerned more about current if you have the original 6 volt system.

Last edited by buoymaker; 07/01/2021 12:41 AM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."