I had the same trouble with a T-5 up to my 230 c.i. L6. I finally found Fort Wayne Clutch and Driveline, Ft. Wayne, Indiana. They made me a 10.5 inch disc with 1" 14 tooth spline for 40 odd dollars. Top job. Great, good people. I used a Pressure Plate from a '72 GMC pickup that had a staight 6, 250. But that clutch was not 14 tooth. Perley