Rear suspension adjustment help

[Nzholden]

Hi guys I'm new around here & as you can tell from my username I'm from NZ (don't hold that against me lol)
Anyway iv got a 2000 VT 3.8 V6 commodore that I got afew months back & it came on adjustable suspension.
Anyway my question is how to I adjust the rear suspension as I'm trying to raise my ride heigh up, I done the fronts which was pretty simple but the rear is different lol.
The pic iv added of the adjustable's (red) are the same ones iv got & the other pic is just a reference & I'm not sure what part to adjust??
Thanks for you help in advanced.

 

[Husky]

My adjustable shocks had a valve in the spare wheel bay. They were factory though.

 

[Tree cutter]

It looks like the bottom spring seat on the rear has nuts for the ride height adjustment. Wind them up just like you did on the front.