I am very new to Adobe Illustrator, so I apologize in advance if my question is offensively simple. To my excuse, I spent and failed to look for a solution online, even though I am sure I am not the first one to encounter the problem.

I created the following plot of the Austrian party positions over-time:

[![enter image description here](https://i.stack.imgur.com/fkn1a.jpg)](https://i.stack.imgur.com/fkn1a.jpg)

Now, I would like to change each symbol for which the party names end with 58 to something else (like an unfilled triangle); the ones with 63 to a second symbol and the ones with 56 to a third symbol. The idea would be to show how parties cluster on the plot, as a function of the specific election.

However, I can't figure out how to change the symbols without manually copy pasting something there. Any ideas? 

**UPDATE:** I should have added earlier: AI does not recognize the circles as symbols, therefore the `replace symbol` option in the symbol panel does not work. Is there a way to get them recognized as symbols?