as you are from France, you could easy contact Intrax in the Nederlands....they make them for race/rally cars in all dimensions/rates ...mine fitted perfect! Not cheap, but high quality.
Even with the black titanium coating ( option)you get a few years garantie against leaking due rock and debris hitting the cilinder piston.
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.