PART NO. STECKO SIZE DIMENSIONS LEFT RIGHT A B M1,M2 N1,N2 S1 7Y9-04 1/4" 1/4" 37.5 37.5 15.16 10.03 19 7Y9-06 3/8" 3/8" 37.5 37.5 20.17 14.02 24 7Y9-08 1/2" 1/2" 37.5 37.5 24.16 18.03 27 7Y9-12 3/4" 3/4" 40.5 40.5 29.16 24.03 33 7Y9-16 1" 1" 52.5 52.5 39.12 31.01 48 7Y9-20 1.1/4" 1.1/4" 55 55 46.15 38.02 55