They are designed to be installed with the coil spring still installed on the vehicle, with the suspension unloaded.
Here is the link to install instructions.
from 4WP HQ
I have a 2003 Chevy Avalanche 2WD 5.3 V8
i'm looking for the air bags in the rear that go inside the springs. They look similar to these pink ones but mine are blue. One of them blew out
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Hello there, the Air Lift Air Lift 1000; Coil Air Spring Leveling Drag Bag Kit part number that fits your 2003 Chevy Avalanche is AIR60769. Shop with us anytime, on your schedule. Browse 4WheelParts.com, call our customer service center, or come visit us in one of our stores. You can even save on shipping costs by shopping online and picking your order up in a store. No matter which method you prefer, we’re ready to help with excellent parts, advice, and service.
Air Lift's origins stretch back to Lansing, Michigan in 1949 and the company has evolved into a major force in the suspension sector of aftermarket parts and accessories for 4x4s. Whether Jeep owners are interested in lifting their vehicles or towing with safety and sureness, Air Lift has suspension solutions. Their motto "Drive it. Show it. Track it." embodies the company's philosophy of tuning 4x4 suspensions to match off-roaders needs for different applications. Air springs, leveling kits, shocks and compressor isolator kits are among Air Lift's products for Jeeps and we proudly carry many of their parts and accessories for Jeeps. Shop AirLift Now