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Mitsubishi Cassette receiver model DA-L70 - speaker terminal plate part needed

Looking to see if parts are still available for a Mitsubishi Cassette Receiver DA-L70 as I need to replace the 2 speakers connectors to the unit as the speaker terminal plate is broken and have taken it out of the motherboard in the box but radio shack only carries a different version of what I need. Is there a telephone number for the Mitsubishi electronics manufacturer that I can call as I do not have the owners manual. I believe it could be over 20 years old.