Speedfreak
2017 GT350
In my long search for a reasonably priced track wheel, it appears that Apex is going to make a square and staggered set-up for the GT350 platform. Check it out!
https://www.groupbuyparts.com/apex-19-ec-7-mustang-wheels.html
https://www.groupbuyparts.com/apex-19-ec-7-mustang-wheels.html