Yes you're right. I guess there has been somekind of change in Ebay policy. What I've heard it has something to do with buyer protection program that's not valid with overseas buyers and therefore listings can't be found. Not sure if that's the correct reason or not.
To see the listings you can use for example SearchTempest and include Ebay listings.
Or change your shipping adress to USA...
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.