Jim, I'm sure it's not a typo, however is it definitely 15.5 cm in diameter? The one off my P-type changed during a rebuild is 16.5 cm. 8.43. Wheel in very good condition. Pinion has one very small chip on a tooth. Tim
I suggest you also join the Pre-war Minor Network Forum if you are not already a member. M types are welcomed as "close relatives" and you are more likely to find what you want in the Morris fraternity and the traders who supply them. There is also a thread somewhere here about fitting a larger CWP by relieving the casing to let the CW pass.