You might want to contact Parasound, Spica's last owner before they were discontinued.
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I reviewed my "e" mail from last November and here is what Brian at email@example.com said "This tweeter is still being built, but with a round flange as the TW025A0. You can buy the TWO25AO and put your old rectangular face plate on the new tweeter. The screw holes line up".
I didn't get them and try it because mine still work but I thought due to age that I might want to replace them.
Hope this helps you out.
P.S. If you ever need to have the woofers redone I had my rebuildt by Millersound located in Landsdale, PA. The phone number is: (215) 412-7700.