I may be wrong, but if you are talking about the cam - isn't it a retainer plate and possibly a thin engineered washer?
But - these would be fitted to the camshaft before pressing the sprocket on...
For the crank - there's a slinger which was deleted on later models, also the Woodruff key. You can use the new damper to centralise the timing chest, no need for the key to be fitted unless you also want to check the damper markings.
Be gentle when fitting the cover/damper, as people have dislodged the garter spring in the oil seal from harsh treatment. Lube it all up well to minimise the risk.