Need help finding speaker connector for B&O BeoVox M70

Got some Bang & Olufsen M70 speakers from my father.  I haven't tried them yet.  They need a special connector and he only had one.  I'm looking for a source to get a set of two.  Here's what they look like:

https://www.facebook.com/photo/?fbid=10160802565148357&set=a.497267698356

Can anyone help me find them?

Thanks!