Check out any of the ten Cam Chain - Tensioner components enlisted.
The Bolt,knock 7x12 is the most widely applied product in the CB250RS 1982 (C) SOUTH AFRICA CAM CHAIN - TENSIONER ( two times ).
Some items from this specific schematic: Bolt,special,6x28, Collar,6x14.7, Sprocket,cam, Bolt,special,6x24.