Three years ago while in workcamping in CO, a hail storm destroyed the vent covers on our Elk Ridge. There was a Camping World nearby, so I went down there & found out there are 3-4 different styles of vent covers. Before we left I had taped trash bags over the vents in case it rained & "sort of" got a look at how they were made & operated. Fortunately I remembered enough of what they looked like and chose the correct ones. Right now I couldn't tell you which ones we've got. I'd suggest looking at the ones on your rig, possibly taking photos then going to CW, or where ever & trying to match them.