You do not want a 12 bolt out of a truck. Uses different gears, has different axles with bigger bearings (hence the difference in size) to carry more weight (the purpose of a truck). Oh and the truck 12 bolt uses a different posi that will break first time you try to launch with slicks.
So since there is no use for a 12 bolt out of a truck except to put in a truck I didn't include it. Just use the dimensions for the car 12 bolt.