Airbagit Air Kit - Manual (Page 9)

Airbag & Bracket Install
Most vehicles have Struts on the front, and Coilsprings on the rear.
If you have Coilsprings on the rear, take care to make sure the spring
is “unloaded” (no weight on the spring)
Remove Spring, and any Bumpstops that might interfere with the
mounting, or the bag travel.
Installing brackets require minor welding once you determine the
exact placement of the brackets.
Tack-Weld in place, then install the bags, and air them up with the
supplied Schrader “Test Valve”