You should put your coach's year, make, model in your signature line (go to User CP a the top of forum page to access/add your "signature") . I guess you have a 2003 - 2005.
About 90% of these rigs are parts used by trucks - so once you have a part in hand the closest NAPA store can usually be helpful. If the fog light bulb is out you may need to pull one out and take to store, but it's unusual for both bulbs to burn out at the same time - more likely the fuse or switch is the problem. Have you tested for power yet?
Do you have the Owner's Manual?
You may want to joint the Beaver Ambassador Club (BAC) they have a lot of Beaver owners and information that can come in handy (but you have to pay to join). You can view their forum for free but need to be a member to post a question or access their technical library.
https://beaveramb.org/join-bac/
Check the links in my signature line. I have some wiring diagrams available. I don't recall if I have one specific to your coach or not. I just provided copies of everything I can find. Hopefully someone will find something useful.