1984 40hp electric neutral safety switch-related

I have a 40HP model E40TELCR with what appears to be a neutral safety switch in the base of the steering handle bracket. At the bottom of the shift lever is a hole which contained the parts necessary to depress that switch when shifted into neutral. One or more of those parts popped off and went to the lake bottom. I am left with one round plastic disk that appears that it would push in the switch, a spring, but nothing to attach to the disk from the other side of the hole in the shift lever. I am unable to find a parts diagram that matches my motor on any of the sites. The attached photos explain the situation much better than the words. Any thoughts?

Did you look for it at the top of the page?

http://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1984&hp=40

Thanks. I have gone through all the 40HP Evinrude parts diagrams on this site and others, which appear to all be very similar if not the same, and in all cases I have been unable to find any reference to the part. I believe I can replace the part by using a plastic automotive fastener and a washer to get the correct spacing, but I was hoping to find the actual replacement part.

Yes I agree with you Mr. Team36

Thanks, all. I found the part I needed (438618) under "Ignition Systems Parts", and the switch at the base of the tiller handle appears to be the starter switch.