The ones hes selling I bet are for the 86/87 Grand National steel wheels. Heres what you can do for the aluminum center caps though. Go on ebay and find some 80's to early 90's Pontiac Firebird/Trans Am center caps for the aluminum wheels. They come in chrome or black and the opening they fit is the same as the T-Type wheel opening. Then you can go to buickgn.com and get custom overlays made for them in what ever style you want. I have pics of the ones I had made up with the tri shield on them if youd like to see them, They look great. Heres a link to the guy I got my center caps from http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZgmQ2atilt