It's fairly impossible to find plugins now that are usable in OBS. Almost EVERYTHING out there has been updated to VST3, and it's not like OBS will even say, "Sorry, can't do it." It just tries, locks up, and requires manual shutdown of all OBS processes, then manual deleting of the recently installed VST3 plugin.
I love OBS, and I love that it's free. But at this point, it might as well NOT have VST support, because nobody ELSE is supporting VST 2.x anymore. (Or at least that's what it feels like after 4 straight hours of trying to find a free VST 2.x reverb plugin.)