Having Difficulty Finding Replacement Roof Vent Covers

Hi, We have a 2011 Jayco TT. The two roof vent covers, one over the bedroom and one over the rear kitchen, are brittle from age and were damaged by a recent hail storm, so need to be replaced.

I have been shopping on the internet -- Amazon, Ebay, and also several RV parts suppliers, but so far have not found a match to the type of vent covers our Jayco has. Everything I have found has had a different style hinge mechanism, plus the connection of the control arm to the vent cover is different. Jayco produces a lot of RV's, so I would be rather surprised if they installed vents that were rare.

I really don't want to replace the entire vents, just the vent covers. I am posting two pics below. The first pic is of the hinge, which is that the plastic cover seems to just snap onto a round mental piece in the base. The other pic shows the control arm and how it connects to the inside of the vent cover where it slides along the white plastic part on the vent cover as the vent is opened or closed.

Does anyone know where to find replacement vent covers of this style? The inside measurement of the vent covers is 14" x 14". Thanks in advance for any information!