Soup,
I did a quick search and found reference to some guy who had some made and was selling them, but it was from several years ago.
I suggest to try the forums at Cougar World:
http://cougar.frugalsworld.com/There are a lot of TM users there. I bet someone there can offer a lead, or help. There is a guy who makes a hall sensor mod for the RCS (Cub Pilot) that posts on these boards.
I would search a bit more, but I am off to pack for a week vacation at the airshow in Oshkosh with Grimm and Crash
Good Luck
Gunner