Hi Squabz,
Many thanks for your offer, but to my surprise the dealer I bought it from has agreed to fit a new speaker, and although I won't know what they fit, it's not going to cost me anything! Speaker technology has come on leaps and bounds in the last ten years, so it wouldn't surprise me if even a cheap Chinese jobby is equally as good as the original Merc one. I know this is next to sacrilege, and I would of course prefer an original Merc part, but at least it can't be seen!
Thanks again
Max
p.s. I wasn't able to find how to send a P/M?