Hi John I got the aluminnum at Metals Supermarkets 9012 S. Thomas st. Bridgeview Il. 708-599-8605. It is aluminum flat stock 6061 t6 .188x1.000. It cost $1.50 a foot. Call them first before you go so they can make sure to have it in stock for you. That address is back behind the View where we go to eat.