My GMC Master Parts Book shows only one part number for 18.0170 in a 1/2 ton '53 half ton (102-22) with no comments about which of the 3...
Not Batt unless you put a fuse in the wire to the dome light as close to Batt terminal as possible. Head will only have power when the headlights...
How about the stuff that the guy on TV uses to waterproof his boat with the screen door in the hull?
I did it Evan's way when I did my '57. I didn't know about the pop-up caps, but I used a stainless screw cap. Had a muffler shop bend a custom...
I'd guess that if it were above the frame it'd be through the engine.
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