I had my Local shop order the bolt for me. This shop is a town over. They claimed they had them in stock is why I went down there. When I got the bolt in I had to drive though that town to go help one of my friends So I dropped by to show them the RIGHT bolt. And they tried to act like well this part number isnt even for a 5.3 its for a ls1. When I say researched the computer system when I orderd it from my local place I was back there with the parts guy having him look up the bolt EVERY way we could think to see if we could ever pull up the completely wrong motor/bolt to explain their error. The part number for the crank bolt is listed as the same for a ls1, 5.3, 4.8 and 6.0 and it also has l33, lm7, lq4, etc as ways to look up the SAME bolt. My local parts guys exact phrase was " I have no idea how they came up with the wrong bolt unless they just looked up the completely wrong truck "