Hi Clair, this is what you wrote before. Now the Speedshop here gave advanced adapter a call and they told him that they never made something for especially a Toyota Turbo Supra. Is it possible that Toyota shares the splines with an other domestic Tranny for that you asked for? We have a problem with ordering than when we don't know exactly what iit is...
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Clutch - Advance Adapters makes a conversion clutch for the Toyota spline in a 10.5" diameter. It's not the most heavy-duty piece, but it's built for off-roading, so it's no slouch, and at $120, it's by far the cheapest option I've seen. Clair