Mate, I've got one on my Special which is very similar to this one here -
Clickaroo!Fits snugly between the grip and the switchblock.Just had to trim the outer edge of the grip at that end to make it work seamlessly. Great for giving your arm a spell on those long trips though I don't recommend trying to adjust it tightly for prolonged use as it could jam the throttle in position if you have to do a panic stop. This is why they tried to ban the things in the first place.
I picked mine up from Powercycle Suzuki in Virginia Brisbane. It is a generic unit and from memory cost about $20 in 2002
Can get a pic if need be.