I called the service department and told them I didn't have my VIN however I know all the features that my truck had. He asked a series of questions on what features my truck has. After that the system told him what wiring harness was applicable to my vehicle. I have since ordered and installed...
"ML3Z13A576j or ml3t-13a576-akb same harness just different ways for the dealer to look up " is the correct harness for a 2021 f150. I just finished installing mine it's like it was made for it ?