UPDATE: A more accurate lamp has been found in a later post and will be used in my build instead.
I found a more appropriately sized red indicator lamp for my left gauntlet.
[ATTACH=full]168516[/ATTACH]
The hole I made for the previous lamp was obviously too big, so I patched it up with epoxy putty to fit the new and smaller lamp.
[ATTACH=full]168517[/ATTACH]
The lamp head is missing a metal ring around its base, so I replicated it with a strip cut from 0.25mm styrene.
[ATTACH=full]168518[/ATTACH]
[ATTACH=full]168519[/ATTACH]
I applied silver Rub 'n Buff on the ring to mimic a metallic appearance.
[ATTACH=full]168520[/ATTACH]
Here's a test fit and comparison against the reference photo.
[ATTACH=full]168521[/ATTACH]