Whelen
Whelen TA20TL12 Halogen Replacement Bulb 01-0462380-01C TA836A, TA837A, TA838A
A nice detail is the rubber band that holds everything together securely.
Whelen H27HACP Replacement Halogen Lamp Clear 01-0463122-COB
What stands out about the amber finish is how it resists showing fingerprints and smudges.