What model are the speakers?
Have you removed the tweeter to see what make and model it is? Most speaker manufacturers use third-party drivers e.g. Scanspeak, Vifa and replacements are often readily available.
Rotosound RS66LDN 45-105 nickel roundwound.
1 set in unopened packet, bought from Strings Direct last year (so genuine, not some ebay unknown) but no longer needed.
£15 inc UK postage.
Payment by BT, please.