All I could find in the steel spacers for my truck were in the 2". The only 2.5" spacers were available in urethane, so I called rough country and asked them about their product. They asked me to think of how long it would be on my truck. The reason being is that the urethane ones tend to deteriorate after time. They get packed down and after a couple years will become 2" spacers. Idk how true this is but I took his work since he was talking about his own companies product. I figured mine would only be on there until I could afford a full lift kit, but on the plus side I could easily sell them after I'm done with them as well. You could always resort to a measuring tape or a park on a curb or some wood of the desired height, step back and take a look.