Don't know where any are at the moment, but I'm sure someone on the board will have some leads. I looked over the past year here in South Florida, but found none. Last time I saw some up close was in the back of a used boat shop in Pompano back in 1988 or 89 and they had two each having a pair of 420's and GIL exhust. They were sweet. For that time a 26' with twin 420's was impressive. Today is as well, but more common.
Good luck on the search