how do I remove 3rd party plug-ins from Logic Pro 10.8

I have two really old plug-ins, one is a tuner from PolyTone and the other is a PSP Piano Verb. I got notices they were broken and should be removed and replaces with modern versions. So OK, I can see the plugins when I go to a channel strip they are way down at the bottom of the plugin listing the audio units section

So how do I get ahold of these files and get rid of them?

Thanks for any help you can give.