Federal supply schedule, FSA group. 25. Vehicular equipment components (formerly class 8, pt. 4, and class 60), FSC class 2520, Brake lining and clutch facings, FSC class 2530, Brake-band lining, FSC class 2540, Tire chains, Nov. 1, 1958-Oct. 31, 1959; prepared by National Buying Division.