Originally posted by perry:
For the 98+ SE/LS V6 MTX's and SVT's the front springs are the same. Rear springs on the Ls V6 MTX and SVT are the same, rear springs on the SE V6 MTX and ATX are the same.
The mailing list archives are down right now, but check tomrrow or the next day, and look at this message . It explains what I just summarized above, showing codes and such for the springs. 
I think I'm more confused than when I started!
From what I can see, I have the same front springs as an SVT, (Code NYHN BTW) and no one is sure yet on the rear, though it seems they might be the same. So a set of used SVT springs would likely not be any improvement for me.
Thanks everyone!
Dave