What's the story on the ultra grate conversion for the early Whitfield Advantage II's. I've the regualar steel burn cup that's got all the little holes in it and it's going away on me pretty quickly. It's cracking around the holes and is warping around the outer side walls. Is the Ultra gate a factory change or aftermarket gimmick? Should I try and get the Ultra grate or stick with a original style? Are they made of stainless steel? If I need the conversion what's the best source cost wise? bjr23