I mostly use aluminum rivets, 3/16". They are easy to install with a small rivet gun from Home Depo, or you can get a big one that will do up to 1/4" rivets from Harbor Freight. I like aluminum rivets because they are easy to drill out and remove if you need to. It's quicker it drill out an aluminum rivet than it is to undo a small bolt. They do break now and then, however, if they are in a more stressful spot, so if you don't think you'll be removing them then use the SS. All of my body panel protection is held on with 3/16" aluminum rivets.