1968 - Pedestal fog light removal

[Toy68CS]

Are there any tricks to removing these?
It felt like the big bolt on the bottom broke lose but it just turns and never gets looser?

[Mosesatm]

The stud is probably spinning inside the housing. Try pushing up on the light by placing a plastic or wood wedge between the light and the pedestal. It may help to hit them with some penetrating fluid and let them sit overnight before you proceed.