The dealer sells them for like 20 bucks. What year is your truck? Let me know if the rear air shocks stay hard. Mine stay like that. I thought they would deflate alittle when you turn of the truck. I had my two kids plus myself sit in the back and the air compressor kick on and raised it again. I guess it works fine. Its just that the shock stays hard. I hope in time it does not leak. Good luck. Throw some pics up when done.