A sample from the products for the Rear Case include: Bolt,flange,cap,8, Gasket,rear Case (nas), Oil Seal,28x48x9, O-ring,63x3 (arai.
In this schematic the "Bolt,flange,cap,8" is used most often.
The eighteen Gl1500c Valkyrie 1997 (v) Australia / Rbm Rear Case component parts are all listed in this schematic.