Thank you.If you google Celestion SL6 you will see
Refurbished Celestion SL6, SL6S and SL6Si Speakers for sale ... Carpwrangler.
He seems to be well into them with plenty of experience.
I found it interesting and a well laid out site with plenty of pictures. If you see the price of original parts it wasnt such a daft thing for me to rescue one.