Try contacting HR Clutch in Bensalem PA. They have been in business for eons. The built all of the Scheiffer high performance stuff for Hurst when Hurst was in Glenside PA. They are really good to work with, can rebuild or build anything, to your specifications or their recommendations, or sell you something new if that is what you need. They have been rebuilding my clutches and pressure plates for close to 40 years, including a decades old scheiffer unit they redid for me a couple of years ago.

http://hrclutch.com/

Mike