You can get a custom clutch from Advanced Clutches. That's Rob Youngblood. He's up in Idaho. You can also get a clutch from Black Magic Clutches. That's Cale Aronson. I forget where he is.
The nice thing about using one of these guys is you can get a custom lever or other things that may make your combo better. I'm using a custom lever. I forget why now, but at the time it made sense.