I am not much help
as I, too, had the same issue. I had two marinas, my nephew on the internet with over 10 leads and my personal efforts with calls, conversations, etc. following up on leads. Never found one!! Problem is, as you probably all ready know, that the hatch is an unusual shape and size. I even looked into the possibility of cutting out for a larger one.....that was discouraged by everyone I talked to due to the way Hunter constructed the decking!! So, I removed mine and completely sealed all around it and re-seated all the screws. This still did not take care of the issue of the broken "locking plate" (which is molded plastic). I, now, use the washer on one side of what is left and use the thumb tightening head of the bolt on the other side. Water stays out and it works....but it is, definitely, not the solution that a new one would be. If you decide to pursue one further, let me know if you find TWO. I'll definitely be interested in hearing about your efforts, too. E-mail me directly at jwk@towerconnections.comGood Sailing--JAY