Been away most of last night and today man... Tornado hit my grandmothers ranch in East Texas and doing all I can to help my father from a distance.
If you remove the stock bar and lift the rear off the ground where the rear free hangs, the axle will basically center itself. Set it back down, then measure hole to hole, adjust new bar and install. Repeat the free hang and the check center to center. You could be anywhere from 1/2" to 1.5" pending lift on length adjustment.
J
Sorry to hear Jason. Hoping everyone is safe and it's a smooth cleanup process.