Pizza oven burner replacement

I purchased a used Vulcan model 7016A1, is a double deck with one burner. The burner Assambly No. 404073-G3 is missing. Vulcan no longer has that part available. What type of burner could I use to replace the original.

It is a 50,000 btu Unit.

I need suggestions as I already rebuilt most of it and I am missing the burner.

Try Heritage parts 1 800 458 5593
George Mills