you can get it all from spruce
Spherical bearings - p/no MB-3 (male left hand thread 3/16 unf). p/no MM-3 (male right hand thread 3/16 unf)
AN315-3R locknut r/h, AN315-3L locknut l/h
connecting rod/tube - cromo tube 1/4"O/D .035" wall p/no 03-00300
Worked out the length of the tube ( from memory 300mm one side, 320 the other, but check), tapped out the tube l/h one end, r/h one end, boltedto carb lever and throttle torque tube arm with an3 bolts and locknuts.
The stepped washer on the carb throttle lever protrudes a bit and has to be filed down just a little so the bolt tightens down onto the lever arm and the center of the bearing then takes the rotation.
I used the cromo tube early on but later have changed to 6061-t651 5/16" hex bar, which of course you have to drill and tap whereas the cromo tube could just be tapped out, no drilling.