Drag chain setup

Hey folks, would anyone know the dimensions for the route1 drag chain aluminum angle piece? On the road and want to pick up but forgot what size aluminum angle to buy. Any response appreciated.

If you are buying from etsy, route one wood designs, the aluminum channel is 1/16th inch thick by 3/4 inch by 3/4 inch by 40 inches long. I bought mine at menards.

Thanks! Appreciate the quick response!