Hard to say. Everyone's Bronco it a little different. Make sure all tires have the same psi, load it how you would have it most often, and measure to a common straight body line front and rear. The difference will determine what block to get. Might help to get someone with a similar weight as you to sit in the driver seat while you measure too. Measure both sides at the same point in case you have any lean issues to. Make sure you are on flat ground with both front tires pointing straight ahead