All available in 12 volt DC with T10 and BA9S available in 24 volt also.

T series twist lock gauge bulbs in 12vDC
T5 Wedge bulbs in 12vDC
7mm (BA7S) bayonet bulbs (with the crimped ears on the side rather than locating pins)
9mm (BA9S) bayonet bulbs in 12v and 24v
9.3mm (T10) Wedge base bulbs.
E10 (9mm) Edison screw base bulbs.