For your purpose, definitely get the 510 dual coil cartomizers (made by Smok Tech), not the eGo dual coils. The eGo ones are wider and will not fit in the CartoPipe.
Also, check with Romaniac which length Smok Tech dual coil cartomizers you should get. He made my pipe for the Mega dual coils, but some may be designed to fit the shorter length.
BTW, I don't know who manufactures these new eGo dual coils. I'm pretty sure that Smok Tech does not. [For example, there is no reference to them on the SmokTech website and none of the current suppliers of them specify "Smok Tech."] Doesn't mean they're bad, just something of an unknown quantity right now. I've not yet tried them so I can't comment personally.