The M-193-002 is a bronze steel backed premium thrust washer for your early Muncie M20,and M21 4 speed transmission. Replace cheap stamped steel washers sold in other small parts and rebuild kits with this premium quality washer. Sold individually. Also a standard item in our rebuild kit BK297 for Muncies with a 7/8 inch countershaft and 297-50 small parts kit. WILL ALSO FIT EARLY T10 / ST10 4 SPEEDS WITH A 7/8 COUNTERSHAFT