These started being supplied with the new S2 chassis and we got them with our 2018.5 and they are nice and easy to install, full coverage and insulated. But like EA37TS said, no markings or part numbers. Most dealers will not order parts if they dont have the part number as they dont want to take the time to search for them. I would email Jayco back and specifically ask for the Part number for them and say that your dealer will not order them for you without a part number. You could also try
https://www.jaycorvparts.com/ While their catalog online isnt up to date, if you call them they might be able to help you out.