BULB MINI LAMP FESTOON 211-2 ANCOR 639 522112 REPLACEMENT BULBS 2PAC BOAT PARTS | eBay
its not a soffite bulb, a bajonet ge90 BA15D doublecontact.
These folks will ship to EU
Ancor is a brand focused on boating.
Must be some available even closer.
@slantsixdan used to be involved in some collecting and selling of older lamps and may know some EU venders