I am finally getting around to installing the 6700 shifters but due to the different shape and size of them compared to my 5600 shifters, I'm having difficulty deciding where (in relation to the handlebar) I should attach them.

Is there an easy guideline to installing shifters on the handlebars? It looks like the hoods of my 5600 shifters are installed so that top of the hoods are inline with the top of the handlebar (just before it starts curving down I mean). Is this a good starting point or is there any other method to determine the shifter location on the handlebar?

Thanks for the inputs.