They're comming guys...I bought a 30 inch square sheet of 5/16" thick material from Carlisle over a month ago, ($165.00). Carlisle is a leading U.S. manufacturer of friction materials.
It is for a dry application...It is very wear resistant...These materials are classified in terms of thier ability to grab at various loads and RPM's...the material I chose, (based on a discussion with thier engineering department), should be perfect for the MB's. This material also has a high heat resistance.
I've got to make up a quick set of dies to punch them out...both the round and the trapezoid shapes.
The engines I got a year ago had fairly dense and hard clutch bits...similar to a linen based phenolic...now it's more like ground up underwear bonded with cheeze-whiz.
Jim