My 87 GT has some old school 15" Fittipaldi rims on it. My question, is there a special tool or key I have to have to remove the center caps? I used my cell to snap a picture of the part in question.

Thought maybe someone out there would have experience with rims like these. If I need a special key or tool where can I get it? I don't want to damage the center caps as I intend to eventually swap these rims onto my daughter's fiero when we can get new tires on them.
Any help would be appreciated, thanks in advance.