PRE-THREADED REED MTG HOLES, UNLIKE OEM CYLINDER. | BORE: 76MM; SLEEVE O.D.83MM; HEIGHT:130.8/113MM; ALUMINUM HOUSING W/STEEL SLEEVE. |REGARDING SM-09608A SLEEVE: INSIDE DIAMETER MUST BE BORED AND HONED TO SIZE PISTON AFTER INSTALLATION. (SUGGESTED HONED SIZE OF CYLINDER SLEEVE: 76 -0.005 / 0.02MM) PORTS CUT TO PRECISION DIMENSIONS AND SHAPES FOR EASE OF INSTALLATION AND PORT MATCH-UP. | OEM: 420613628