Alcoa Hubcaps issue

[ImNoSpaz]

I'm trying to get these caps off so I can get new tires to bring the truck home. It's been sitting for over 20 years. American Racing chrome (over rust) wheels, 8 lug 1 ton truck. They won't budge! Not even a wiggle, nothing.

There's a small oval shape cut out in the lip of the caps. It looks like there's a small bump like a detent but when I push it in, nothing. I even took a small screwdriver and knocked that bump in where it touches nothing, and still can't get them off.

Does anyone know what to do other than destroy them? American Racing said they were vintage and had no manuals or any documentation to help me. I want to save them because I searched everywhere I could and they seem to be extremely elusive.

HELP!