There is nothing special about the brand you are looking at or that it's the brand that Jayco using for their installs. Do yourself a favor and search
Monoprice. They have good quality mounts that won't break the bank. Moreover you can find a mount for pretty any application you can come up with.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)