Just to confirm, the upgrade to bigger (08+) brakes on a dynatrac prorock60 conversion from the mid 2000s not only requires new steering knuckles but new hubs as well. Higher placement of the caliper is required to fit the bigger rotor. You can re-use the Warn locking hubs but a new wheel hub is required because the bore on the rotor is different.
Sportsmobile has the 14.5" with a rotors with an 8 x 6.5 bolt pattern on their online store. Part # DA601125T.
Dynatrac Ford Front Rotors - Sportsmobile Store