I think ur really confused hehe

Springs and Shocks are different items. BUT you need them both for sussy. If u like pedders springs more than the kings brand, then get them instead. THe yellows are not like coilovers where u can adjust with a spanner. They have a spring perch which can be set at normal = stock OR lower = 20mm lower

So there is no need to be messing around with height on the yellows UNLESS you want to lower the car a further 20mm after you have the whole setup installed.

If ur springs provide u with a heiight ur happy with, then leave the shocks alone.

edit: sorry my bad. got confused between king low and superlow.