Hi,
Not sure just how much of your vent was destroyed, but if it was just the plastic lid, I picked up a perfect fit for my cracked
Boler cover at Camping World, on sale for about $l5.
All I had to do was undo/unscrew bolts and screws, slip out the raising mechanism, slip off the cover sideways, then reverse the process with the replacement.
Hope yours fixes just as easily.
Des