I got 4 x 25mm spacers from adaptec speed ware, am very happy with the fitment.
All four corners are equal and right on the fender, not sticking out like 4x4.
I also have lowering links, so it looks perfect.

I have 08 GTS with 21" gts wheels with factory 295 tires.

 

Any before and after pics?

 

Before:




After:

 

Beautiful thanks!!

 

Are there spacers that will work for aftermarket 22 inch wheels or only factory sized wheels?

 

Yes I found some on ebay, bought the full set with longer bolts.

 

Just ordered spacers from Adaptec. I'll post before and after pictures too!

18mm Front
23mm Rear

 

We can build them for you. Send a PM with the info.