3-1/2 in. x 1-1/4 in. Galvanized Steel Wood To Wood Rail Connectors (2-Pack) 50120-1 - The Home Depot
Amazon.com: SUPPLY GIANT OQHM1112 4" X 12", Malleable, Pre Cut Connectors, To Build Vintage DIY Furnitre, Industrial Steel 1-1/4 Inch Threaded Pipes Nipples and Fittings, Galvanized, 1-1/4 in. x 12 : Everything Else