I have a 2009 22.5 WSM and am trying to resolve the charcoal grate interference issue with the bottom vent. I need someone with a new charcoal grate to measure the diameter of the new grate (the one that sits below the vent holes). My grate is about 18 ¼” in diameter and I was wondering if Weber used a smaller grate or did they actually raise the vent holes? My Performer charcoal grate fits just below the vent holes but the ring will not fit on the Performer grate. I am trying to make some clearance for my Guru adapter. Any help would be appreciated.