I'm assuming that you're talking about an eGo-T or -C, since the atty/carto models don't have a type. If that's the case, then you've just discovered the reason that many people switch from the -T/-C model to something that uses cartomizers, or just straight dripping.
The
tank that fits ontop of them with that lovely annoying pipe-tip is pretty much the only way you'll find that type of
tank. The -T was my first non-disposable e-cig kit, and I loved it until I decided to try a cartomizer. The cartomizer wasn't what got me switched though, it was the silly drip tips.
Try a 1.7 or 2.0ohm cartomizer, there's a bit difference in the filling of them and a slight flavor change, but it'll let you use the awesome drip tips.
Also, the eGo Mega Dual Coil Cartomizer (Gosh, that's a mouth full) and some of the other mega/giant type cartos have proprietary drip tips, since they're funky sizes.