Try these guys
Light Vehicle
what i did was similar to the LR OE but not automated
i had coil bags with 2 LPG lock off switches one to let air in and one to let air out with an in cab switch and gauge. Wasn't automated but it was all in cab and a press of a switch. I had the air comp all hooked in also. So when i had weight in the rear i would flick the switch and let air in to the bags until i was happy with ride height and everything was level.
Parts
2x lock off switches
6mm or plastic tube 10 mtrs to be safe
push lock connectors
set of coil bags
psi guage
few relays and some wire
few hours in the shed
I am going to set this back up with the alloy tray due to the huge difference in load carrying coil v's nothing in the back coils
Also if you are going to buy coil bags you can get the Firestone ones direct from the US much cheap so shop around and then you might want the 2" lift bags or you can buy the rubber spaces from polyair
HTH
Mick