The clutch driven discs are the same for early Buick's up thru 1925. When I opened my clutch, the driven discs were scored. Later I opened the clutch that I bought on Ebay, and the discs were not scored but pitted beyond use. I made a drawing of what I think is the original disc cut out, but then the disc went thru a stamping process to make the inner tabs. This is shown in the first powerpoint. I was also thinking about what is the easiest and cheapest way to make these discs using today