I have a Nash 26X and replaced them this week, and no, not all vents are the same.
Most likely it's a Ventline vent. And Ventline makes two covers with two different styles of hinges on their vent lids. One is metal and the other has a plastic hinge - no, they don't interchange.
If it's a Ventline with a metal hinge, it's #BV0554-01 for the white lid or #BV0554-03 for the dark tinted lid.
The plastic hinge is #BVD0449-A01 for the white lid and the tinted one is #BVD0449-A03.
The lids rot out from age and UV damage. If you have more than one, change all of them while you're up there.
Read the instructions. On the metal hinged ones, BEFORE YOU GO UP ON THE ROOF you have take the inside screens off and take the two screws out of the vent mechanism that raises the lid. For this you need a square drive bit. Leave the mechanism hanging there, go up on the roof with a flat tip screw driver and a pair of needle nose pliers. you need to bend the hinge clip out of the way on one side or the other of the hinge. Then slide the hinge lever down to the round key way and remove it from the lid. Watch out, there' a keeper clip that you can drop down inside of the TT. Then just reverse things.
I believe the lids are available from Amazon if you don't want to drive to go get them.
Bill
