The upper A-arm mount needs to be removed from the OEM coilover. When removing the mount be sure to use a spring compressor on the spring, otherwise have 911 on speed dial because odds are someone is bound to get seriously hurt. If you don't have one make a trip to the local shop, it shouldn't be but a small fee for them to disassemble the coilover.
The AirStrut also uses this bracket to mount up as well, but first the opening in the top of the mount needs to be opened up using a 7/16" drill bit for the upper stud mount of the AirStrut to fit through.
Then the OEM mount is bolted to the AirStrut just like it was to the OEM coilover
Before John installed the AirStrut, he installed the air fitting using just a little bit of Teflon for a secure air tight fit.
The best thing about installing the AirStrut is you don't have to compress a single spring, or set the ride height like you do with a coilover, all you do is bolt the AirStrut to the lower A-Arm and then install the upper A-arm and mounting bracket and your work is done.
Installing the F9000 air spring in the rear is just as simple. Start by placing a jack, or some kind of support underneath the rear end. Then remove the lower shock bolt on the axle, and the upper shock nuts located inside the trunk. By pulling back the trunk deck carpet you can get to the nuts.
With both of the shock absorbers lowered the rearend will drop down just enough to remove the rear springs.