The Rubber,insert is the lowest priced item on this E-1 Cylinder Head Cover - Camshaft Holder schematic.
Parts such as the E-1 Cylinder Head Cover - Camshaft Holder: Bolt,flange 6x10, Tube, 12x260, Bolt,cylinder,222, Cover Comp,brthr. are included in the Cb400p 1980 (a) Police General Export E-1 Cylinder Head Cover - Camshaft Holder parts fiche.
The most expensive part in this assembly is the Cover Assy.,head.