Are you referring to the dome that raises up to open the vent? or are you referring to an add on hood that fits over the vent to allow it to stay open while on the road or in the rain?
You didn't post a pic so we don't know what the tabs are you are referring to. Fantastic makes a hood of their own, it is larger than most but allows full opening of the vent and flows more air than any other hood. I installed one on my Winnebago View (now sold) and was quite happy with it.
https://www.dometic.com/en-us/outdoo...le-pack-144311
Charles
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'03 Ram 2500 CTD, 5.9HO six speed PacBrake std cab long bed Leer top and 2008 Bigfoot 25B21RB.. Previously, 2008 Thor Freedom Spirit 180, SOLD! 2007 Winnebago View 23H Motorhome, SOLD!
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