I think you are talking about the thin sheet metal plate between the block and the front of the ZF Housing....
Isn't that a standard Ford plate that comes with all 351Cs? I would think so, since the ZH housing has to marry up to the "stock" holes in the engine block....
That's what I assumed, anyway.
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.