I don't have a link, and my fins are Wesmar, but they have kelp cutters that have been effective at preventing snags of kelp, line, etc. Basically, in front of each fin a stainless steel
blade is mounted to the hull
in such a way as to prevent anything from getting between the fin and the hull. When kelp or whatever hits the blade, it is either cut or, since the blade is angle to allow kelp, etc., to slip down the blade and away from the hull, displaced to about 10" from the gap between the hull and the fin. Since the fins are also angled, kelp, etc., is forced down to and off of the outter edge of the fin. The stainless piece is pretty heavy duty. Probably 3/4" thick, 3" wide and about a foot long, welded to a base that is equally beefy and secured to the hull.