[jims69camaro]

any of the aforementioned fasteners will work, if you can avoid putting a hole in it. the thing is, a hole will never seal up correctly, whether you weld it or epoxy it. putting a hole in sheetmetal should be a last resort. with stud welders' price where it is now, especially.

getting someone to hold it for you while you tack is the cheapest way out. you only need two or three tacks and it won't move anymore.