Use this page to create your own DOT Identification number set plus a custom business name, and city,state lettering set. Generally the DOT numbers need to be at least 3" tall (height) but check your own state laws. We recommend you use Impact font all capital letters and a contrasting color to the surface of your vehicle. When you get to the last step you'll receive a bundled discount if you buy everything together, you can also scroll down to purchase individually if you prefer.