You need a 5 or 6 inch gear seperator and a hydrqulic press.
The rings are going to have debris and also have corrosion from galvanic action.
Don't listen to this, your's must be the only one that is corroded BS. They all are except possibly the ones that are owned by the special people.
These things are cast aluminum and were press fit on the shock new.
WD40 will help but without the gear seperator you might be stuck on them forever.
You can rent a seperator at a NAPA store. You don't even need to buy one but frankly I don't know how to finish the job without a press.
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.