Try Ebay and doing a google on "jayco popup slide replacement" found several on different sites. Not sure if that is what you are looking for.
If still stuck, try calling ETrailer.com always try to answer my questions even when they don't have the part.
2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6