No Rex, All the parts are different. What you probably were thinking is that the 1LE spindles and rotors is a common mod. That mod makes the front track wider and doesn't help with bump steer. There is no cheap way to make the front end on the G-body perfect. An expensive one is here:
http://scandc.com/new/node/742
I have done all the common stuff to my GP and its not bad/not great. I think modern rubber is the next thing to do (no 15 inch tires).
FYI, when looking for all the different bracing that the G-bodys The later Grand Prix's have most of it installed from the factory. So, look at those in the junk yard for braces.