The Crankcase is made up of components including this Crankcase Assy which is the most expensive.
On this parts fiche the Gasket(10.2x20x2).3 (nas) is the most specified component.
This Crankcase diagram displays the required parts for the Vzr1800 Boulevard M109r 2012 (l2) Usa Califo Canad (e03 E33 E28) Crankcase.