Mine (same as most of the 06 Monaco coaches) are from a Ford pickup. They are fogged on the outside even though it looks like moisture inside.
I thought about replacing them but I bought a Mothers polishing kit and with an 18v drill and some masking tape it takes about 10 minutes twice a year. Compared to buying the parts and installing them, polishing them when I wash the coach is not a big deal.
By the way, if you buy the cheap ones you can find online you will find they fog again pretty soon, so you need to buy good ones. Don't ask me how to tell the difference, but if Monaco had bought good ones we wouldn't be doing this!
2006 Patriot Thunder C13 Allison 4000
2010 Ford Flex Ecoboost AWD