Hello Rscott, I bought mine used from a member of this forum a few years back. He had an '83 V20 in great shape and I was told it was the factory bimini and enclosure that came with it. He sold it to me for $550, w/ bimini, bimini frames, and all curtains. It shipped it from Florida to NC. I have a '94 V21 which has curved side windows - so I had to add some snaps to the side curtains to match up to the side windshield on the boat. Other than that, great fit.
It has more than paid for itself over the years. In the summer I just use the front curtain to keep the spray and wind off my face. In winter I put the full enclosure and throw in a propane "buddy" heater and it is very comfortable. Fished once when it snowed 2" and would've never made it out there without the enclosure. Good luck and hope this helps.