Brian- I added the hinges last season. I did not over think it. The admiral loves them. Me, not so much. Make sure they separate. I used SeaChoice, I believe. I installed them so they could separate, but the shelf above does prevent this. So, the hinges shown on the link Steve McGill posted has the hinges you want. They will allow removal of the pin with the top raised, but not outside of the countertop opening. That is key.
My SeaChoice hinges will not separate if the lid is not above the countertop, so they must be unscrewed from either the lid or the counter/fiddle I screwed into.
My SeaChoice hinges will not separate if the lid is not above the countertop, so they must be unscrewed from either the lid or the counter/fiddle I screwed into.