Honda's have a similar problem. They have a technical bulletin which recommends Lithium grease (So that's what I did on 6868) Get the spray kind and spray in the track, then wipe- off excess.
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.