I can't pretend a stranger is a long awaited friend. -Neil Peart
Can you get a shower trim and glass for these ? It would help with sealing them and you could use the existing lamps.
Collect vintage incandescent and fluorescent fixtures. Also like HID lighting and streetlights.
I bought a Commercial Electric LED light that can be installed to either a can light or a 4" box. I'm not sure which cans it will work with though, and it mounts to the surface of the can, so it's not truly recessed, but more like a flush mount fixture. They're also wet location rated.