I believe Ford is using a metric bolt pattern on the newer light duty trucks. We tried putting a set of take off 17" off road wheels on an older F-150 and the patterns were just a hair off. It reminds me of the 390mm rims Ford put on the early 80's Mustangs. Just a hair off from 15"

78 Ranger 4x4 351C-4V
83 Ranger 302