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Ah, I see the problem now. I can't find a standard bearing with 40x20x14 so I suspect the quoted dimensions are incorrect. The 6004 is 42x20x12 as you have stated. Not having looked at the bearing I can't confirm the correct number. It's pretty easy to get at the bearing to confirm the correct number and Simply Bearings have always delivered new bearings overnight. If I remember correctly the only difficult part is winding up the kick-start return spring when reassembling. I used a piece of string in the end to hold it tight.
Don't forget to check the layshaft bearing when you have the kick-start off.
Sorry this doesn't really answer you question.
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