"BILSTEIN B8 5100 (Ride Height Adjustable) shock absorbers are designed for front coilover style pickup and SUV suspensions. With the use of multiple snap ring grooves to position the spring seat at different heights, the vehicle's ride height can be changed anywhere between 0-2.75” depending on application."
Just the front. Rears are not ajustable. If you want to go up in the back you need spacers or springs. Spend some time over in the 4th gen lift and suspension thread. All this info and more is there. Including pics of truck with the combo left you are looking at.