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With the correct size hole-saw a new install should be easy. Borrowing one from a plumber would be ideal as they get expensive in those sizes (3 3/4" to 4 3/4").
I'll snap some pics of mine when it gets light out.
I see Beckson offers a passive vent rated @ 350 cubic feet per hour in a 5-knot breeze. White plastic-$25.99 or stainless-$47.99. Not affiliated, just looks like a good deal.
Not vent related but here is a shot from this spring:
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