You might want to look for one of the several Jayco related websites for help on this. Most of us hereabouts are into molded
fiberglass trailers such as Casita's Scamps, BigFoot's etc. While some of these accessory parts are similar, actual construction and attachment points may be very different.
Now, if you were here in SoCal I would recommend my local Jayco dealer, Richardson's RV, in Riverside, CA, they are good peeps.