I believe the Mark Williams stub axles are machined to accept either stock 12mm x 1.5 Pantera wheel studs or stronger 1/2-20 studs. They are also available gun drilled.
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.