intrigue springs = grand prix springs, in a sense. the only thing different is that the rears on the intrigue have a higher spring rate. get it?
you do not buy SSC for an intrigue or a grand prix as they are the same springs.
The Intrigue springs are your best bet, I think the Wbody store sells them or you could contact ED MORAD.
I bought a set of them for my 97 and they worked out really good, even with a
150# speakers in the trunk.