I'm sure Greg can chime in on this more, but I don't think the specs are available.

GM should have them, and Borg/Morse should have them. But, I don't think GM will let them release the design specs or produce any more. So, it would need to be reverse engineered.

I took a set into a machine shop a few years ago, and they wanted $2500 PER GEAR, and had no interest in doing it.