Ken if you do, try and locate the grill out of an old, round Weber charcoal grill....they were a perfect fit to sit inside the flange of the semi rim. I THINK it measured 23" in diameter? If you round up everything with that in mind, it fits like a glove.
And since a lot of campers apparently knew that also, I had no problem finding the grills along with the rims....most simply packed up their campers and left, leaving coleman lanterns, outdoor cooking appliances, and even two perfectly good aluminum jonboats. When I added those to the ones I already own, I have a boat left on shore at each of our five ponds!