The old MIT2 biwire cable I have has spades that are too narrow for the posts on my Hegel and Ampzilla monoblocks.
How about Spade to Banana Adapter
https://www.transparentcable.com/products/transparent-spade-to-banana-adapter
https://www.thecableco.com/cab-banana-single.html
http://www.cardas.com/cabd.php