I just got a free JL 10w0 sub, but its got a torn (and repaired with epoxy ick) foam surround.

I know i can get replacement surrounds from active surplus (downtown toronto) but the cardboard ring that reinforces the surround is mostly missing.. i dont know why... does any one know where i can find a replacement for it?

and what kind of glue should I use to glue it back on?

tested the sub, seems fine otherwise, so if i can fix it for 20 bux or so, id be happy...