They are not that common and a lot of folks have spend a lot of time looking for them. In the last few years a dealer has appeared on that action selling kits.

http://www.ebay.com/usr/davispeedequip?_trksid=p2053788.m1543.l2754

I don't believe the kits that are being sold are OEM, for what ever that maybe worth.

Larry

Ignorance can be fixed Stupidity is forever