At least that's what I think it is. After replacing shocks and struts and tie rods I couldn't figure out why I still had front end noise on rough roads. Then I found the bolt shown in the picture and it was loose enough to spin by hand. Tightened driver's side and then found the passenger side is missing. I don't want to take the first one out for fear of not being able to get it back in. Please tell me what size bolt that is?!