I found this info really helpful! Was able to order a couple key banks from eBay. In case it helps anyone else the blank for the door is an Ilco F91C.
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.