Eber tail light, without brake light lens, with 2 phase bulb socket ►see details!!

The socket takes a bulb with the mounting pins straight across from each other. Unfortunately there are no 2 filament BAY15D light bulbs with 2 pins straight across, only with staggered pins. The solution is to file away 1 of the pins of the light bulb.  The remaining pin is enough to hold the lamp in place. Update April 22: the supplier now grinds away part of the socket, so that the 2nd pin also fits. A bit of a rickety solution, only slightly better than filing away 1 pin of the light bulb   Concave back plate