This is somewhat akin to trying to make the fender off a Camaro fit a Mustang, it isn't going to happen. The stuff is all custom made for the RV companies or by them, and when they change designs, and run out of stock, its GONE FOREVER.
Winnebago was the best about turning the molds for plastic trim, storage doors, etc. over to a third party for storage and to custom make parts on request for customers. Three or four years ago that company had a fire and many molds were destroyed. Its hit and miss now for WBO products and I do not know if the service is still available.
'03 Ram 2500 CTD, 5.9HO six speed std cab long bed Leer top and 2008 Bigfoot 25B21RB.. Previous, Being repaired and will be sold, is a 2008 Thor/Dutchman Freedom Spirit 180. SOLD - 2007 Winnebago View 23H Motorhome.