As many of you know, firebird centercaps work on TType wheels. I think some of the vendors sell them. I was at a big swap meet yesterday and found a vendor with boxes full of these centercaps in both black and also chrome ones. They all have various firebird emblems on the top, but you can remove them and put a Buick emblem of some kind. The price per set was $50 for 4. These are new. Here is contact information if you guys need a set or 2. They also sell all kinds of spacers.