HF,
Is this what we would call a J-trim? Check with Barbour Plastics as well as Trim-Lok. You also might want to call Marine Surplus in Bradenton, see if they have some old stock, doesn't necessarily have to be Aquasport, as a lot of builders use that type of trim. Probably MCL over in Ft. Pierce has some, but I figure Sarasota is a little closer to you....