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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Vampire SB Banana to Spade
PS Audio Spade to Banana
Audioquest - Gold #1002 Banana Plugs
Monster Cable MBD R-HT Dual Banana Adapter
Cardas CABD Dual Banana Plug
Monster Cable X-Terminator Banana Pair
Audioquest 2002/G Double Banana Jack Fits Up To 9 awg 2 Pair
Cardas CAB Single Banana Plug
Just to name a few.
The easiest to use are the Monster X-terminators.
They cost $29. a pair new, and will last forever.
I have some 'old style' (with a screw inset instead of a thumbscrew) and have used them in different ways for over 20 years and STILL use them. (I own twelve of these babies)
They lock into the binding post, create a solid connection, the spade is locked into the X-terminator with a set screw and will not come loose accidentally, and they are 'eternally' reusable.
Try AudioAdvisor for retail sales of them.
May other types are available too, but most do not lock into the binding post.