Hardwatergrandpa: Thank you very much for all of the effort you put into helping me out with this....mystery solved!!!! I actually had finally figured it out today and came up with the same part number. I went to eBay and started looking at photos of Evinrude carbs to see if I could locate one with this retainer on it. As I was searching, I found a carb from a 1984 35hp that showed a picture of this retainer on the linkage. I went to the Evinrude site and searched for the exploded view of this carb and, sure enough, there it was...part number 0313329, Retainer, throttle lever! I don't know how many of those diagrams I searched that did not show the retainer at all. It shows another part in its place that simply doesn't exist on my motor, so I guess somebody did fail to get it right when they did the drawings.
Once again, I really appreciate all of the effort you put into helping me with this. I have already placed my order for two of these retainers (I figured it can't hurt to have an extra one on hand..just in case). Hopefully they will have them in stock and I'll have them this week. Thanks again for all the help!