Air Lift52440 Air Lift Spacers

How do I select 4” spacers with axle mounting brackets?! Spinning my wheels for weeks and Firestone can’t give a straight answer even with all the ph?

I ha e a 4 1/2 in lift will these work?

Will it work on my airlift bags that are on top of my axle on a 2000 silverado

These don't say whether they are 4 inch 6 inch 8 inch