There are 2 offsets because of a body mount location mistake on early side mount equipped cars. The left side was the worst. If you use the deeper version on an early car, it will push out the rubber bushing out. I can not help you right now but you should know there are 2 offsets.
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.