Here is where I got them...http://www.barnettclutches.com/2056/triumph/0/0/2006-triumph-speedmaster.html

You need to say Stock plus XX"...where XX" is how much longer than the stock cable is. They (local Harley part store NOT the Dealer) will say they don't do Triumphs but go in with the Barnett number and Stock plus XX" they will order it for you