I guarantee the opening that switch fits in is a standard size, if you can't find a single one to match what you have that still works, maybe replace the whole lot with new ones, at least then they'll all match. Plus, if anyone on here needs one of what apparently can't be found, you'll have the working ones you pulled to sell them...
1. You get nice shiny new light up switches that work.
2. You help someone who's RV needs a switch like your old ones.
3. You make some money.
There's no charge for advice like this...
Can you tell I've got nothing better to do right now than browse through this site?