I've come to find out there are not many if any tuners on the ATS forums, but I am one and I can help you. Because the bolt pattern is an obsolete 5 X 115 (thanks Cadillac, real smart of you ~ sarcasm) and no one uses that bolt pattern any longer no (reputable) aftermarket wheel manufactures stock wheels in that pattern. TSW does carry a few styles in that pattern but they are not specific to the ATS so they are likely not hub centric and may not clear your brake kit of you have the Brembos in the front. So you are going to have to work with a retailer that has direct connections with the wheel companies and get something custom made. I reached out to D3 Cadillac and they got me wheels. I ended up getting Rays like what they used on the D3 ATS simply because I was not willing to go after one off custom forged wheels at $1600 a piece like I had to with my Lexus IS-F (bought that very early in its production before there was a market for wheels for that car too). D3 said they can get wheels made for the ATS now that they have the dimensions to give to the manufactures. I went with the Rays 57 Xtremes because they look amazing on the D3 ATS, are a high quality wheel, and fit with my plan for the car. I put 19 x 8.5 on the front and 19 x 9.5 on the rear. Got my tracking numbers on Friday and should be here this week. The team at D3 are great and Ro who helped me with the order was amazing to work with. He also set me up with Toyo's and preinstalled TPMS for a great price. Now I am patiently waiting for D3 or H&R to put out a suspension product... Send me a PM if interested and I will send you his contact info