This is the Crankcase for the O.S. 95AX Ringed Engine (OSMG0580). FEATURES: Aluminum construction Silver in color INCLUDES: One Crankcase REQUIRES: Installation of remaining engine parts SPECS: Width: 43mm (1.7") width of engine neglecting engine mounting flanges 26mm (1") distance between centers of the mounting holes cnh 8/12/09 ir/jxs