Just make sure to describe them well so they'll get hits when someone googles for the product.
I needed to replace the "flavor bars" in my Weber grill. Weber makes them in porcelained steel or stainless ($$). When looking I got a hit from someone selling replacements on ebay that were stainless, thicker gauge than weber's, for about 60% the cost. Made by someone at a metal fab shop that had the shear and brake to cut and bend them. Great product.
Old bed frames make great flavor bars. Cut em with a hack saw or
whatever. Make sure you burn the paint off before cooking over them.