Both sets of wheels I have owned from Hall Pantera had spacers front and rear around a 1/2" thick. These are really nice spacers that actually are bolted to the wheels. You won't find them at your local auto parts store, but I'm sure they can be duplicated.
No complaints from the performance of the wheels or spacer just have to make sure you have enough threads on the studs to have good engagement of the lug nuts. The Hall wheels use mag style lug nuts that go deep into the wheel and spacer not an acorn style nut.
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.