Change plugin icon for OF toolbar?

Hello, I added a few plugins to the toolbar for quick access, however they all have the same generic plugin icon and I would like to change them.
I tried to change their icon the same way as the scripts (changing the icon in the information window), however the new icon is only visible in their Finder window, not in the toolbar, even after I rebooted OF and my iMac.
Thank you for your help!

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