Absolutely! We carry three different tire models in a 285/35/18. You can check all three models
out at this direction link.
Don't forget, you can build your own wheel/tire package in a sense. Select any two or four rims/tires within the same order/purchase, and they'll still be mounted/balanced for free! This way you can get a package that best suits your needs if it doesn't already exist.
Feel free to place the order online or give one of our Mustang Experts a call at the number within my signature. They'll be happy to help you out!