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: Pin-dowel, Bolt,6x25, Chain,camshaft,79rh20, Ring-o.
The most reasonably priced component used on the En450a2 454ltd 1986 Usa California Canada Camshaft(s)/tensioner is the Ring-o.