It appears you've went under low branches or something to break them off, usually they vibrate loose, yours appear to have the center bolt broken off.
Once replaced put a drop of thread lock on the center bolt to prevent them vibrating off in the future.
I would recommend not asking any future questions of that CW. Those attic vents have been on longer RVs, maybe others also, for several years & they've never seen them??
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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