Hi, it is important to order your front springs by spring code in order to assure accurate replacement. Our primary recommendation would be to contact a local Ford dealer for guidance in determining the correct spring code for your F-250. We found a 3rd-party website which explains the codes and the label where they are found. We offer this link as an alternative source for you, with the understanding that we are not responsible for the accuracy of this information: https://www.blueovaltrucks.com/tech-articles/ford-truck-spring-codes/