Installed a set of Black Billet Aluminum 25mm Hub Centric Wheel Spacers from CJ Pony Parts today. These will do until I get new wheels and tires put on next year.
Saw these on an EcoBoost at Watkins Glen and knew I'd be getting them. They are designed for the S550 Mustangs with stock wheels.
Put this on under the hood from Anchor Room. You have to request this via Email using their Contact page. Cost was $59.99 (less 10% discount for a total of $54.00. See their FaceBook page for current discount code). Easy install.
The Pony is under every 2015-2017 hood. Just remove the hood...