Don't have a 22 WSM, but I use gaskets on my 14 & 18 with stock door and have no leakage and tight lock fit.I am a bit torn on this. It seems that as I have cooked more and more on my 22 WSM, the stock door seems to have gotten worse. I am really leaning on getting one of the Cajun Bandits as I am losing quite a bit of smoke/heat out of the sides of my door. I assume the ultimate fail safe would be to get the door AND the door gasket kit. I question if JUST starting with the gasket kit and stay with the stock door would be enough. Anybody try the stock door with a gasket kit yet?