Denon POA 2400 plastic speaker binding post cap

Hello I have been having the devil of a time trying to find this cheap black plastic cap to attach to the speaker output binding post on the back of the denon poa 2400. I just cannot believe how hard it is to find these things.

any idea where to find or if u can suggest an alternative or generic so my speaker wire is properly secured?

MANY thanks!
I don't know what your binding post looks like. Madisound has a lot.