Try www.newfoam.com, www.woofer.com/woofer, or www.steppaudio.com. They make repair/replacement kits for surrounds, maybe they will have something you can use. I've never had to use their products, but comments I've heard were favorable. I have repaired speaker foam surround with RTV, and glued cones back together. If you don't change the cone alignment or the flexibility of the surround, you should be able to help your woofers.
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