wheel identification

This may sound pretty lame but here it goes... I just bought a used pontiac and i have no idea what kind of wheels are on it. They don't say. They just have a logo that almost resembles a cross between an Infinity and a Oldsmobile logo. I am pretty sure the model wheel isn't made anymore but I need to find out who makes it so I can get the centerbore. The car was missing a centering ring when I got it. If someone has an idea of what manufacturer might make these wheels go ahead and throw the name out and I can research it. I can try and post a pic ASAP. Thanks in advance.