What is the serial number of your Longchamp? Does it have the Cam Gears, or the ZF rack?
HereĀ“s the patent for the Can Gears one:
http://worldwide.espacenet.com...&NR=1243854&KC=&FT=E
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.