If someone wants to crank a few out, here are the specs with a few notes.
1- The .625" diameter flange has to be thicker than the recessed area in the levers. If it is not thick enough, then the nut will tighten down and it won't clamp the pilot side of the larger flange into the recess and the stud will wobble.
2- The pilot height is critical. If it is too long, then the bolt tightens down on the end of the pilot and the stud wobbles.
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A shop that is setup for production work would blow through these quickly and cheaply if the demand is there.