Ebay is often a good source
Before you do anything talk to the best who will likely repair them better than new for an incredibly reasonable $ amount in a matter of days.
@shtinkydog Millersound will only do the repair, which requires disassembly of the speaker, packaging the midrange as per their instructions and shipping to PA from here in Oregon.
@ervikingo Thank you for the suggestion but I dumped facebook years ago. I refuse to patronize Meta/zuckerberg. That being said, I looked at American Vintage and they appear to be a shadow of what they used to be.
@erik_squires I spoke with the person at Miller Sound and he was quite helpful and nice. Answered all my questions and was very patient. They are definitely a solid research.
To all following this sad thread, I bought a pair of drop-in replacements from SimplySpeaker. The units arrived Friday. Well packaged, the chassis/frame was an exact fit for the mounting holes in the Kappas. It took roughly 10 min/speaker to remove, snip, strip the wires and solder the leads in place. (Note: Keep the plastic dome cover in place while you have the driver face-down, lest you crush the dustcap/transducer. The mids sound wonderful! I kept the original polydomes and will have them redomed some day, but being retired, that is not on the budget right away.