You could try here:
Jayco RV Parts
There are a couple of ways to deal with them. First, there is a link on the main page to download a full PDF catalog that you can look through. Second, if you click the "Order Now" button you will get a form to fill out where you can provide details regarding your RV and the part(s) you need and they will do the research and identify what it is you need. Once you have the part details back then you can call them to complete the order.
I was having a hard time getting a replacement leg for the dinette table in our 195RB and finally came across this site and was able to order the proper replacement.
TT: 2015 Jay Flight SLX 195RB Baja Edition
TV: 2014 RAM 1500 Big Horn CC, 5.7L Hemi, 8-spd, 3.21LSD, Factory Air Ride/Tow Pkg, Andersen WD/SC