Good question, and the answer is you do have to physically look at the hinge of your RV's vent in order to know the cover you need. There is no way to know any specific trailer parts based just off of the year, make and model of trailer.
If you refer to the accompanying photo I added, you can see that there are four types of hinges:
A continuous hinge such as the Ventline # BVD0449-A01, 4-point hinge such as the Replacement Lid for Jensen RV Roof Vent # CAM40154, and 3-point hinge such... view full answer...
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