Yes, it's the rear springs you need to replace when you delete the rear air shocks. I did not need new spring insulators but it's hard to tell their condition until you tear into the project. For the price, it might not hurt to have some new ones on hand.Hello. I have the 2011 armada platinum. I'm doing the delete. I'm going Moog and Billstein. Question- Do I want springs for the rear as well and do I need spring insulators? How many?