spring install problem

i have a set of adjustable springs and they dont work on my stock shocks. eventually i was planning to upgrade my shocks but i was gonna wait a little, but i guess im gonna have to. do all aftermarket shocks have a flat base for the spring to sit on? thats what the problem is. the stock shocks have a cup for the spring and my new ones wont work. any help would be appretiated. thanks in advance.