Hi Mate,
The details of the factory organic drive plate is as follows:
Outside diameter (Friction Material): 240mm
Inside Diameter (Friction Material): 160mm
Thickness (Friction Material): 8mm
Spline No Teeth: 24
Spline Diameter: 25.6mm
I can supply Exedy drive plates, available are the following
Standard Organic
5-Puck Button
8-Puck Cushioned Button
Sports Organic (Higher Copper Content Then Standard Organic, Exedy Racing Range)
3-Puck Button (Cerametallic, Exedy Racing Range)
4-Puck Button (Cerametallic, Exedy Racing Range)
If you are interested in a price on any of the above just drop me a PM