Speaker Connectors: Banana Plug conversion adaptor to spades

 you could look at audioquest or cardas has them
 
could also do a google search  banana plugs to spades and there are other options on Amazon.

Actually, though not audiophile approved, I have found Monoprice connectors to fit my needs.  A number of them are gold plated, they are very inexpensive, so you can try them and if you don't like them you are only out a few bucks.  I also like their HDMI cables.

For $10 for each spade, Zu will re-terminate your cables and they'll look great. I had their speaker cables and went the other way, from spades to bananas. They'll even pay for the shipping back to you and the turn around time was one day. If you decide to go that route, just call them in advance to set it up. Great guys to deal with.

All the best,
Nonoise