I thought thete was a topic on speakers but i couldnt find it, so i'll post this.
Whilst waiting for my new airsprings to turn up, ive gotten round to fixing the subwoofer speakers. Like many, the foam rings were perished. I looked for ages on the web for some that might fit. Ebay came close but the measurements were a couple of mm off. I eventually found these and have fitted them. Fit perfectly and job done.
I was looking into replacement drivers but struggled to find (A) a drop in fit and (B) reasonably priced. Since my cones were in good nick, i decided to do em up.