Quote:
Originally Posted by Luddite
As well as the colour difference, as Utopia said, aren't they also identified by a code letter? I think it's 'M' for the old ones and 'O' for the new.
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But I believe the markings are only on one end of each stud, so whether you can see them depends on which way up they were fitted. They may be at the bottom, in the crankcase, but you'll only see those when you've taken them out!