Here is what I did using a Walmart driving lamp. These are 50 watt lamps. The fixture has a built-in reflector. The intended landing light fixture was barely fitting in the opening. On checkout, found the filament on the bulb to be open circuit. The replacement bulb at Walmart was $18. A new set of two lamps, fixtures and accessories was $17. The lamp fixture was a third the size of the old one. So, I bought the whole new set. Then had to fill in the cut out in the inside of the wing skin to mate with the now flat pedestal for the new fixture. Used cotton flox epoxy with a waxed wooden plug for the 5/16 ss bolt hole through the wing. Drilled a 5/16" hole through the new bracket to use the 5/16" ss stove bolt with nylon lock nut. Now have a spare lamp with fixture. If the lamp in the right wing fails, then I will put in the new fixture and lamp.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA smw...@md.metrocast.net