If you're going to buy a replacement vent dome at an RV store, just take the old plastic dome off and take it with you to the store. It's much easier to match 1:1 with the old one in your hand rather than to try to remember if it was "square there" or "rounded here"...
If you're ordering offline, there should be a part number/lot number/name molded into the plastic "somewhere".... You'll usually have to remove the dome to find it, so back to the first part of the "suggestion".....
Good Luck.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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