I don't know what kind of bars you will be using but this company built custom axles and custom hollow anti-sway-bars for my race cars many years ago. Great job and no failures.
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.