I upgraded my vintage Airstream trailer collection to all LED bulbs but in the end I ended up with too many bulbs ( I didn't realize when I did my light fixture count that some of the fixtures used different types of bulbs )
My loss your gain... I have approximately 15 extras. $7ea
I will guarantee that they work.
See attached link for image
27 LED Bayonet Bulb
12 Volt, 0.3 Amp, 3.6 Watts, (300 Lumens)
Replaces Festoon Bulbs in Navigation Fixtures and Dome Lights.
Replaces up to 20 Watt Bulbs.
Reverse polarity Protection.
Single Contact Warm White Part #450305
Overall Height 5.2 cm