Through some investigative work on gmpartdirect.com, I have figured out that the soft ride suspension on the 2000 bonneville, (SE) is the same bar we have on the Aurora front.
The good news is that the SSEI bar then should be able to also bolt up.
I have never heard anyone doing this before so I thought it would be a cool thing to try.
BTW the next gen aurora already uses the heavier bar. I remember all the reviews talking about the firmer handling on the new aurora.
This is also the front bar in the seville sts for 98-00