I just ordered a set from GM Parts Giant. Part number is 461854. $6.29 ea. Cost me about $25 for a set of 4 plus shipping. I ordered a bunch of other stuff to capitalize on the shipping though. GM parts direct shipping is $12.50. GM Parts direct is a flat $9.00. By the way, the nuts are a different part number which is 11516073 and they are .98 cents each.
Ron