Woofer Problems

I have a 16-year old pair of Goetz MS3 speakers, which have a 15" woofer. I just took the grills off for the first time in months and noticed the rubber-like edge around the subwoofer has just crumbled! . . . on both woofers (altho one was way worse that the other.) Do I need to replace the subwoofers or can they be re-coned? Do reconed speakers perform equivalently to new ones? Any recommendations for companies that do this kind of work? Any responses to my email address (markwhite02@home.com) would be appreciated. Thanks, Mark