Kevin, Not to hijack your thread but I picked this little number up from E-bay this week. I wasn't interested so much in the arm but the clutch extender that came with it. Not as sexy looking as the CNC versions out today but the price was right.
These became real popular in the 80's to reduce clutch pull effort and there were several designs out (such as EZ-Pull) which fit most bikes but had so much slop that it was a pain to keep adjusted. That was a problem with these, yes it made the clutch pull lighter but the clutch adjustment range became very sensitive. This clutch arm was for an IT465 and was in slightly better shape than my YZ clutch arm.
Here is a picture of the differance in arm length:
Plus I think the IT arm is a little beefier.
Five minute deal to drop in place.
Turned my four finger clutch pull into a two finger pull. These extenders go for as much as $40 but the arm with attached extender was around $25 shipped. Nice.