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Morelock and
gycho77
I don't have any accurate measurements but I have several caps (as an example I have the Shimano 600 ones). What would it take? I assume each ridge would need to be photo'd and measured? Not sure as never done this before.
As for shifter boss covers, this is a factory original. It was named the Sun Tour cable stop for aero mount. There was a similar Shimano labeled one.
There was a similar Shimano labeled one and it was more elegant.