May I ask why?
The problem is, the stock ones are EXTREMELY heavy!!! So that's usually one of the first things to go on a sled. People usually don't keep em because they aren't worth much..and it's very rare that someone is ever looking for one......THAT is the reason why you are having such a hard time finding one.
Hope that helps.....you might try a local dealer, and see if they maybe have a "take off" lying around their shop.
Good Luck,
Steve