All home centers like Lowe's, The Home Depot and Menards, as well as the local auto parts stores carry pop rivet tools and pop rivets. I an automotive project, I would use stainless steel or aluminum rivets due to their rust resistance. You can also use the old method by utilizing an air hammer with a rivet set head on it and a bucking bar. They call this bucking rivets. It is commonly used in marine and aviation applications. Make sure both parts are tight and the holes are the same size and correct for the rivet being used. This will ensure a tight, long-lasting connection, especially on a grill that will be subjected to constant vibration.
