22mm will not work, as it is metric. 7/8" is the proper size. even when the exhaust is cold they should be really tight, mine were. so u have to put out but make sure u keep the socket on the sensor cuz if it is at an angle it will round the edges, there isnt much for the socket to grip on.ever regret something almost immediately? trying to install the iss exhaust. quickly it's become a real pita. i have a 7/8"-22m o2 sensor socket and it just keeps slipping off and starting to round the edges.
anyone know what size it requires?