Easy fix
Who says those newfangled cars are hard to work on? That's one of the easiest! Apparently BigDonno is stuck in the past and doesn't own any metric tools. 15mm for the idler pulley bolt. Left Hand thread. If it's just the bearing/pulley that "exploded" you can just replace that. The tensioner arm on those tend to last a good long time. So if there's nothing wrong with the tensioner itself, I'd just replace the pulley and get on with my life.
'08 Lucerne, '02 Park Avenue, all the old ones are out of the stable...for now.
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