My son's 2000 Bonneville SE has a suspension crossmember that has rusted and the driver side trailing arm connection bracket has separated from the crossmember. I'm having trouble finding a crossmember at local pull-a-part type junkyards and I believe the problem is the employees are not that knowledgeable and they don't have access to a good interchangeable parts program. I found on this forum a post about the same problem with replacing the crossmember on a 2000 Bonneville and they got the part off of a LeSabre. Through online research I found a GM site that showed a picture of the part so I know it was the correct part I'm searching for, and this site stated that the part would fit a Bonneville, a LeSabre, a Park Avenue, a DeVille, or a Seville.
Is this correct? and Are there multiple years of these vehicles that have the same crossmber as the 2000?
If so, then my searching is over because pull-a-part had 7 of the year 2000 of these different model cars.

I think the LeSabre is a sure bet, I can't quite confirm the others but I'm sure someone else will chime in.

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-Car Guy Carl
"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles