Well it was pretty straight forward, loosen trailing arm bolts, undo handbrake cable bracket, remove the Panhard rod, undo bottom damper bolts and disconnect and lift on rear bumper until springs literally fall out, remove the spring locating cone.
Fit airbags inside springs and replace to truck, connect airlines and route to convenient mounting point for inflation valves. Lower until dampers can be re attached, Lower to normal attitude and tighten all trailing arm bolts, replace Panhard rod and handbrake cable bracket.
I took it for a test run uninflated then the same route with them inflated to 20 psi. Since the reason I fitted them was to make the 100 series more stable when cornering as it did feel soft on the back end and tended to wallow. I suppose it has to be taken into account that the 100 is heavy, with the ARB's front and rear ,winch, the iKamper roof tent up top, awning too, drawers, long range tank with an extra 25 gall of fuel etc etc.
Well the top and bottom of it is that it felt far more stable on corners without the ride at the rear feeling too compromised and a mod worth doing if your weight is going vary and your suspension is the normal steel variety.
Karl, they came next day, I was asked what lift the truck had and they fitted just right when not inflated.