I recently replaced the turn signal assembly and it appears in the best photo I have of that area that both brackets are part of the steering column. Also shows that in the parts catalog.
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.