I know Apature makes such an animal. It is a dual banana plug & spades go between where the between the screw head on back & the metal body of the dual banana plug. Banana plugs are standard .5" spacing. Would imagine most single banana's or dual bananas with metal bodies work the same way. They should only cost $10-$15. If you're nice to your audio dealer where you purchased your speakers, he may give them to you at N/C. Just use care to buy a banana that fits the distance between your spades.
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