they probably are, a refoaming kit will be the least of the worries, if the cone itselves has holes in it, it will get more difficult, it will be possible though, if the VC is gone (due to rubbing or so) it will be really hard.

but if it's impossible to find any reconing kits for them, you could get a pair of new woofers, which are similar to the originals. but there will always be a difference in sound then.
no one asked yet, but what speakers are they? Mc speakers are decent stuff, it will be worth to repair them.

Good luck,
Bert.