Looking for inside intercom speaker

I know that Music and Sound (Nortek Company) is no longer in business. I believe it was purchased by Nutone and then the original warehouse had a fire. So parts are scarce. I am looking for an inside intercom speaker to add to my current system which was installed in my house 20 years ago. If you know where any of these parts might be locate I would be forever greatful. Thank you. Julie Phillips

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