I got mine and was excited to give it a try, and it became evident with each 18.5" kettle I put it on was that the LID does not fit securely on this ring.
It does fit securely in the bowl and a cook grate does set nicely on the lip of the ring, but each lid I tried, and I have run the gamut with a No Date Code Bar-B-Q-Kettle, "G", "AU" and "EZ" Smokey Joe Platinum, that if you are OK with a cockeyed lid on the ring, then this mod is for you.
Me, I'm not all that thrilled with this ring.