my passenger side part of my hood wants to buckle when ever i open my hood, well closer examination im missing my bolt thats infront of the rubber circle, what size bolt does this take?

 

im not sure exactly which size bolt it takes. but you can always remove one and size it up at a hardware store like lowes or something. also when my hinges started buckling a little i took wd-40 to them and it now opens a lot better