With a quantity of four pieces, the Bolt,sprocket Fitting is the most used part in the CAMSHAFT(S)/TENSIONER diagram.
Some items from this specific schematic: Bolt,6x25, Chain,camshaft,79rh20, Camshaft-valve,exhaus, Bolt,sprocket Fitting.
The most reasonably priced component used on the En450a4 454ltd 1988 Usa California Canada Camshaft(s)/tensioner is the Ring-o.