If anyone is looking for an aluminum tracking fin, I saw one available at Show Ski Nationals this weekend. Made by the guys at KW Show Ski Equipment. It was not a cast aluminum fin like the old style, but it looked like a great alternative. It was roughly 1/4" thick aluminum plate welded together to form the base and the fin. It looked to me like this would be a great option for anyone missing their fin. If you can not get a hold of KW directly, I know the guys at Lake Elmo Sports can.