I asked the same question when I needed a tweeter for a Soliloquy SAT5 and found that Underwood HiFi had bought the remaining stock of their drivers when Soliloquy stopped production. That was at least six or eight years ago and I think I've since read that no more are available. Might be worth a message to https://www.underwoodhifi.com/. Walter is a very helpful guy.
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Here ya go. I’d contact upsideof76 as per the thread here. Also Dave Berman as per the thread may also be worth contacting. As a very happy (and sad) fellow Soliloquy owner, I wish u best of luck. And please let us know I u find a viable place for parts.