I recently picked up a Rocky Mountain 10x16 carbon steel griddle off Amazon. It was mentioned on this board by another user as fitting the GA perfectly. It fits quite nicely, as it can rest on the same ledge the grate typically sits on. Unfortunately it can dip and tilt down in the corners when downward pressure is applied. I don’t want to be in a situation w something like bacon going and I accidentally tip it and grease pours into the flame. So I added 4 quarter inch stainless bolts and washers and nuts to just under the ledge to keep it from being able to dip. Now it’s nice and snug, and I can store my grate on top of the griddle in transit. Lid can hang off the back as well when cooking. Pic is after the first couple rounds of seasoning the carbon steel. It’s passed the egg test so far!