Put spacers on my truck with no problem, The first 100mi. bottom spacer broke and had to drive 18 hours on bag sideways under truck. The plastic tabs broke off and could not be repaired. Would never by plastic item again. Made steel spacers out of pipe and two cap plates on each end with bolts welded from inside of cap plates. Cant believe they put plastic under 5000lb. air bags???? DO NOT BUY THIS PRODUCT FOR UNDER YOUR BAGS!!!!!