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Had a look at the ones put by for my GPO WM20 and WB30 and Ian is right its the rear chain guard mount which differs. Left marked 65-7578 Right 66-7602 Rob
email (option): robmiller11(a)yahoo.co.uk
66-7525 was the outer cover on 1940 M23 and 1939 M23 M24, how did it differ from 66-7502 M20 & M21? Is that the version with the shallow clutch dome? Rob