Yes you need to be patient and use a sharp saw blade.
Not enough material showing to press these bushings out.
It is possible that there was a tool for this in the original "shop tool kit". I have never seen the Pantera kit though.
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.