HI Bob
Your picture #2 has both kinds of retainer rings that I have. The smaller is the same kind in my UC lamp whereas the larger is the same that I have for the Cab 13 lamp. None of my reflectors have the hole for the park light but one of the CMP lamps did have it wired.
I have noticed that both your reflectors and mine are identical except for where the sockets plug in as they would be Chev/Ford specific.
I found I needed a third hand to remove the bulb from the Chevy lamp. One to push the socket from the rear, one to hold the reflector and one to twist the bulb out.
I woud say from your photos that the UC mk1 lamps and the Cab11/12 lamps shared a lot of common parts and would be interchanable to a point. But with the Cab 13 trucks it looks like they went back to the civie style lamps as had been used on the cars and truck of the period.
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Jordan Baker
RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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