I've been looking with no luck to find used OEM to replace the tweeters on a pair of Realistic Optimus 50 speakers. I'm wondering about the experience of others when replacing the 0766 tweeter with some other used but non-OEM tweeter. Any experience using a modern tweeter? The 0766 tweeter's frame measures 2 5/8" square; center to center screw holes measure 2 1/4".
Thanks, in advance, for any suggestions or guidance.

Thanks, in advance, for any suggestions or guidance.