I apologize in advance for the strictly boating nature of this post.

I have a Four Winns 195 Sundowner. Although I have a full cover for the boat,
it's too cumbersome for regular use during the season. I'd like to get a
cockpit-only cover (sometimes called a "tonnneau"). I have snaps across the
windshield and along the gunwales and transom.

Other than having one custom-made, are there any sources for such an item off
the shelf?

TIA
Joe Parsons