Lowed has rivets and rivet washers. Use as short as you can get by with. Use washers any where its pulling into fiberglass. Steel rivets work a little better to hold the mounting plates, alum rivets can work loose on a hood. If you don't mind re-riveting every now and then, alum is ok. I use alum on the button spring plates and springs.
Try to make the rivet pop in the middle of the pull, not right after you get a new bite on the stud.