Ron,
The VMPS woven carbon fiber drivers are proprietary and rare, and won't be easy to find. Brian had the drivers custom manufactured, using his own stock of carbon fiber, at Misco. So, these aren't off-the-shelf woofers. But, the same or similar woofers were used in many different VMPS models, including subs. Keep a look out for speakers for sale too.
Also, I posted about a pair of the 12" drivers for sale on eBay, in my For Sale thread. I don't believe the woofers sold. As such, you could contact the owner directly, to see if the woofers are still available? Email the owner through eBay. Here's the original eBay listing.
http://www.ebay.com/itm/VMPS-12-034-Super-Woofer-Pair-Misco-OOC12W-4C-/152097938340?rmvSB=true&hash=item2369be5ba4%3Ag%3AAokAAOSwciVXP6Zb&afsrc=1&nma=true&si=jB01tMjKVZiCKpTH1t4VdjQ0k74%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557Another possibility, is AC Member, Patrick Malaga. Patrick purchased most of the left over VMPS inventory, after Brian passed. The left overs included drivers too. Patrick has a Craigs List ad running now, showing some drivers.
https://sfbay.craigslist.org/eby/ele/5971919620.htmlYou can PM him too, through AC.
http://www.audiocircle.com/index.php?action=profile;u=82446If I come up with anything else, I'll let you know.
Good luck.
Stimpy
Oh yea, here's the contact info for Misco. Maybe they can recommend replacements. After all, they should know; they made the woofers.
http://www.miscospeakers.com/contact