Ref my previous on cabin lights.
I had fitted led bulbs which worked fine but the weakness in them really is the switch.
Replacements lights being expensive I found switches with 15 mm barrels.
I filed the lugs off the lights where the switch would go.
I then made up two short leads and connected to the main feed.
The photos show the leads leading off either side but they need to feed back through the housing to allow light fitting to fit flush.
Total cost about £3[attachment=0:1l6av4wi]image.jpg[/attachment:1l6av4wi]