Have to say the GM idler parts are steel and real quality bearings unlike some other vehicles plastic crap.The Old one was still in very good shape. Bearing still tight at 91K miles, so it did not need replacing but I put a new GM one in anyways.
It is a Left handed thread and was an easy install with a long handle ratchet, however the belt gave me a hard time as it came off the lower cam pulley.
Had to get someone to get under and get it back into the groove and then let ratchet free to tighten it back into proper alignment.
I called it a few foul names....
Used red locker on bolt. It aint going now where.