Where are tailcaps measured?

I need to get a replacement tailcap (http://www.kaidomain.com/product/details.S020344) for my Crelant 7g5v2 and was wondering if most tailcaps are the same size? And if so, how are they measured (is it overall diameter or just the inner ring)?


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Most tail caps are the same size (14mm). For height I'm not sure because I don't have my calipers handy. I think they are 6mm tall, but don't quote me on that.

The opening diameter is where they get the 14mm. Overall diameter is around 18mm.

Thanks for the help Joe!