looking for a reasonably good quality o2 sensor /22mm removal tool , previous one you could see flexing as you tried to undo the sensor , all the ebay ones look much the same
I use a long reach socket which I slotted myself, and also ground the outside down for clearance on a recessed bung. I suppose you can probably buy one made properly for a few £££. I used to use a box spanner but it was not really up to the torque required.
22mm aviation ring spanner failing that I use a deep 22mm socket, if the plug won't go through the spanner then I just cut it out and use an open ended spanner to refit