Heavy duty gas grill burner for large custom grill

I have two 3/8" plate steel grills that a friend welded up for me years ago (4'x 20" x 20" each) and I would like to convert one to a gas grill

I need a heavy duty burner or two which I plan to hook up to a crawfish boiler regulator. Being such a large grill the replacement burner sets at Home Depot aren't nearly enough BTU's to be of any use. It's a fairly straight forward DIY with some SS pipe but if there are commercially available options I'll save myself the time


Any suggestions?