Sorting through sealed beam units for the spitfire

Didn't know know these existed till i had this car. The glass and light bulb are one unit.

I had some spares and had to try them all to figures out which ones work and don't. Some had only high pr low beam. Success, out of 6, 3 work so no new purchase needed !
Note the wiring of the bulb from the photo.

I had to order indicators though as in France can't have lights and indicator be the same bulb.