Weak link
Just a suggestion, I know you are looking for the stock replacement parts, but...
It appears to me that one of the weak links in drive line of an "X" frame car is that center support piece. You can get stock replacement parts "over the counter", maybe even from your GM dealer, but if you are dealing with any torque you might consider that billet piece
.
I purchased a stock replacement item from NAPA, not a chinese piece, pretty good unit, but decided to switch over to the billet piece from SC.
Your call!
Best,
TomK