I have the 98 a4 sport wheels. 16's I believe. I'm missing 3 of the center caps. Do you know what size they are and the best place to get replacement ones? There are so many choices and I don't want to get the wrong ones. Here's a picture of my wheels.

 

Try achtuning.com. They have a variety of center caps, and if they don't have the ones you need, I'm sure they could find the correct ones for you.

 

Great thanks.

 

ebay has a ton of them but sometimes they are manufactured slightly out of spec so they could be a little too small or too big. too big is a small problem as you can sand them down a bit. they're pretty expensive from anywhere else though