666109, 666110 LEFT AND RIGHT REAR WHEEL CYLINDERS FOR M SERIES TRUCKS MODELS M15, 15A, 16; 1949-53 TRUCKS MODELS 14,15,16, AND 17 WITH ANCHOR PIN TYPE FRONT BRAKES AND HI-TORK TYPE REAR BRAKES
BRK924, 681068 1 3/8" REAR WHEEL CYLINDER FOR 2R-14-17,3R-E 16,17,28,38, 3E-6E 16,28, 7E-8E 25,28,35 THESE ARE FOR TRUCKS USING TWO 1 3/8" WHEEL CYLINDERS PER WHEEL