I ordered up some new water pump bolts for my 2008 Chevy 6.0 LS engine. I heard existing bolts on LS water pumps can be quite corroded so I decided to have the bolts on hand for a future water pump. The engine has over 255,000 miles. They are class 10.9 metric. I attached a sheet on metric bolts. As much as I would have like ARP stainless bolts this a more economic solution for me. Enjoy.