Replacement for speaker binding post

Check Parts Express!
https://www.parts-express.com/Search.aspx?keyword=speaker%20binding%20posts&sitesearch=true

What is the thread size?You could try this Amazon.com: Conwork 6-Pack Speaker Terminal Binding Post Banana Plug Socket Connector for In Wall Plate: Home Audio & TheaterCheck out picture #3 and #4 these might fit.

I’m actually shocked that a dealer wouldn’t support a line it sells because you purchased something used online. That’s like a Toyota dealer not servicing my car because I bought it used. 
 Even though with the above links you’ll probably get them for a better price as this dealer sounds like a real tool. 

Sumiko is the US importer. They should be able to assist with parts. http://www.sumikoaudio.net

That's ridiculous the dealer won't help.... I would never step foot in his store again

Buyer beware...Sonus faber does not support product bought used! Ridiculous way to do business if you ask me... 

That would definitely keep me away from Sonus Faber

aolmrd1241,

What do you mean by "Support"?  They won't sell you a part or anything if you bought a speaker used that is now discontinued?  If you purchased a Sonus Faber speaker that has been discontinued, customers don't have the option to buy a new one if that line has been discontinued.  I wonder if it is only on their current lineup.

djfst...

http://www.sumikoaudio.net/en-us/our-brands/sonus-faber/warranty

Well, I bought mine used from Audiogon so I have no idea who is the original dealers. I guess all these audiophile stuff are somewhat niche product, so they don't really go out their way to offer great customer service for everything. I had similar experience with Stax headphone (way worse). 

Anyway, thanks everyone and I bought the item recommended by alucard19.