If you are in the Greater Phila area Bill Legall of "Miller Sound" in Lansdale, Pa. is a real craftman and can do just about anything with speakers. You can check out an article about him at 6 moons.
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Gordon Waters at Audio Atlanta has refoamed many Advents. I think he charges $30 per speaker plus return shipping. They're on the web. If you go to AudioKarma Gordon posts there a lot under GWaters. Audio Atlanta is also an advertiser there. It is dangerous to run the speakers with rotted surrounds. The coil will start slapping around in the gap and deform the former or worse, short out and possibly damage your amp.