Hi ninjazuuk,
My zook came with the 2" Kings springs and 'Ultima' shocks when I got it.
I did not put these springs or shocks in by choice.
As you can see in the pics above, I have made the springs work much better but I am yet to change the shocks. The Ultima shocks IMHO are crapola. The ones in my zook have fairly stiff valving, and they limit droop a fair bit (they are close to full extension just sitting on flat groung -not good at all!). I don't have any part numbers to give you at the moment sorry.
Ultima shocks for a "Sierra with 50mm lift" can be purchased off eBay, however I do not know if these are the same model as the ones in my zook (I hope not, cos mine are definitely NOT correct for the application)
My zook is off the road for a heap of improvements at the moment. Fitting new shocks is high on the list of things to do. I am looking closely at the Hiace / VS wagon combo, as these WILL be much better than the Ulitma's I have now. (Some say valving on the Hiace / vs wagon shocks are too hard, some say they work great...)
If anyone can advise of a better "off the shelf" shock option for a sierra with a 2" spring lift, with standard mounts then I am all ears! (I know that extended bumpstops are definitely required for this - that is no problems!)
I hope that helps you ninjazuuk,
Pez
91 Sierra soft-top. My Members thread: http://www.outerlimits4x4.com/viewtopic.php?f=16&t=169128