Do you want the exact part you have show?
I have never seen that exact hub cover.
If you just need the steering wheel center plug and DT medallion you can get them from Steve Wilkinson at Panteras by Wilkinson in California.
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.