Air Bag Installation

[wayno]

So I'm installing my new porterbuilt drop kit and I've hit a question that I'm hoping one of you can assist with tonight - otherwise I will give nate and gang a call in the am. The kit comes with Ride Rite 9000 bags and it's pretty obvious how the top of the bag connects to the bridge using a couple of bolts - what isn't clear to me is how the bottom of the bag attaches to the lower bag mount - the bolt for the bottom of the bag isn't but maybe 3/4 of an inch long and as you can see from the picture the nut in the bottom of the bag is recessed about maybe 2 inches up into the center of the bottom of the bag - do I need to put some air into the bag to be able to bolt it up, will the bag just compress under weight or am I just plain missing something obvious - any insight would be greatly appreciated.