It turned out we had the newer part, and it was covered under Timken's 1 year warranty.

Today, roughly 2 weeks later my wife reports more ABS/traction control sensor issues. It has been running well with the problem seemingly fixed. We are about ready to ditch this frigging car. I don't think we'll buy another GM in a while. What a sucky design! **** we haven't even gotten reimbursed for the warranteed bearing yet! I'm pissed about it.