That's a rather old sub isn't it? Have you considered upgrading to a new driver?
Fi Audio is known to do generic recones, if the voice coil size is acceptable.
I know there are newer/better speakers out there, but I have been looking for one of these for quite a few years. And I just recently acquired this one at the price of free, so I am going to top off my old school soundstream system in my Supra.
I believe it is a 3" coil, check with woofercooker he hooked me up nicely.