, MF20 (Eff. Transmission S/N DC2064), MF20C. -Captive Disc Spec: Woven; 1-5/8″ 25 Spline Hub; Solid Center. -Flywheel Step: 1.720″ +. 030″ Air Ring = 1.750″. -Size: 11″. Call us toll-free at1-888-6PARTS6 (1-888-672-7876) or directly at517-347-7033.