Search Walmart.com for Camco vinyl insert or also called yinyl insert trim. I just did a search for "Camco insert molding" and it came up. Comes in white or black and a couple different widths. Check the prices because of different vendors for the same thing. Cheaper from the Walmart warehouse than one of their vendors. There was $4 difference in the 1" width so there can be 2 different prices for the same thing. From Walmart it the 1" was $13.30 for 100' and from a vendor called unbeatable sale.com it was $17.52. Where it is shipped from is in the information on the right column. Amazon is like that also, depending on the vendor. You can save shipping if you have it sent to your local store and you go pick it up. By the way, Walmart can provide many (but not all) of the Camco products.
2014 Palomino Puma 25RS
2011 F-150 Super Crew XLT
Days camped in 2014 - 23
Camped 2015 - 47
Camped 2016 - 51 done - 6 more planned so far