I used 1" spacers on my 2020 Mustang GT. If you are using stock wheels. The best part is that you don't have to trim the studs with the nuts. Now there are some wheels that which also don't require you to cut the studs with nuts, it just depends if there are pockets between the studs on your wheels.or not.Use red threadlocker on the studs from the spacer to the hub.Make sure you "Reciprocate them after a few hundred miles. Okay, now you, like me and a lot of other people, are going to think that if we use this threadlocker, we don't need to re-tighten them properly because they won't move. Well, they probably won't move , but the bolts only push into the wheel spacers, so you can usually slide in a little more if you tighten them, and after a while of riding they slide in a little so your pads are loose. Remember to pull them up after a few hundred miles and then it's probably a good idea to check them again in a few months. These wheel spacers are just as good as any other wheel spacers you will buy for two or three times their price. I would not put quality parts in my 2020 Mustang GT.