F37 - two bulbs

Two bulbs from F37's light fittings. The metal parts for one on the left were badly corroded and broke up as it was removed, you can see the "rust" tidemark. The right hand one seems to have survived intact, but may not work, currently [sorry] untested.
These look very much like 24volt "bus bulbs" and there is an LED "bulb" that looks almost identical ...