US 93.3...
First of all...welcome to the best RV forum out there on the web!!

I will ask a couple of questions that may help you in your search along with sending you to a couple of links...
This first link... will take you into a Prevost site. You can dig around for a few hints of where else to go...
This other link..will take you to some Prevost publications ... You will also see a Parts Ordering link connected to this site. You may be able to find some stuff there also.
Do you know who did the conversion...at what location? Maybe find that and contact them..
Good luck in your search....and again...Welcome to iRV2..please post often with your questions...concers and just fun stuff that you can share!