Prestige 500 side burner grid replacement

Trying to replace/upgrade a side burner grid from cast iron to a stainless steel one. Found a part number s83012 and see some controversial stuff. Napoleon site shows with wavy bars and BBQGuys have it with straight bars. The problem is that I can’t see how to order from the napoleon’s website. There’s no “add to cart” button. Anyone ever ordered directly from Napoleon? Thanks!