Somehow the nut that keeps my front shock in has been knocked off. So as of right now nothing is holding my shock in place. I was wondering if anyone who has changed their shocks/springs and unbolted this nut if they remember what size it is? I want to go pick up a nut from Home Depot or something to hold me over until the part arrives at the dealership next week (Dealerships don't keep the nut in stock and would take 4-5 days for it to arrive). I thought it was a 20mm but I have tried it and its too big. If anyone remembers it would be a great help! The gm part number for the nut is 22716359 . It is number 16 in this diagram:
ehhh sry bout the size need to click to blow it up =)

 

If you only lost the nut to one side. unbolt the other side and take that nut w/you to home depot or something to get the same one.