I have an '89 19ft and replaced all the
lights with led units. The main cabin
lights are now 2 switchable bulbs on each unit. Theyre cheap on amazon and very bright, and the lenses down
fall out after a rough road. If you really want to try and keep it original, I have found that
bigfoot used some generic items which are still available at big box and online rv stores. The company who did the
windows is still in business in canada, or was a few years back. You may be able to get parts from them. I know they were able to make replacement
windows. I cant recall the name but somewhere on this forum you may find the same discussion I did and contact them.