..get the thunderbike bars..they're 1&1/2"..and work with the stock risers or the rivcos..but ya gotta get a longer front brake line to use the rivcos, which is something I want to do this winter..
in this link they show 1&1/4", but they do have the 1&1/2"too..
No, I don't even have a Rocket III now, but I did test ride one and found the handlebars to be too far forward for my liking. One of the first changes that I would want to make are to add risers, but I didn't know the size of the Rocket III handlebars. I didn't know if the Scoot Works risers would work and was hoping that someone out there would know. Just waiting for the 2010 Roadster to arrive.
Thanks Hellfire,
I try.
Sixguns,
if they'll make a 1" riser it'd work, but you'd need longer cables for sure.
Anything further back than the Triumph or Rivco will need longer, as they're maxed out with them even after rerouting.