Jim, Newmar uses Ford and other headlamps for that time period of your coach. Had a link to Lampziller.com that had direct replacements for motor homes, Newmar's. For some reason their link is now not working.
Within this thread there are other links that will work. You may have to call them direct for your replacement. Most headlamps have part codes on them for reference for cross reference for replacement.
You can call Newmar repair for year of your coach and what lamp housing they used for that year.
I have
this LINK that may help but you may have to call them too if you can get type from Newmar.
Running lamp lens should be able to pickup at auto parts store will have to compare with what you have now off shelf.
Oemy's web site has a method of cleaning the head light lens.