Cartos come in 2 lengths
Standard = 35mm not counting the 510 threads.
XL = 45mm
Carto tanks also come in those sizes, though with custom or hand blown glass tanks, there is some variance.
You cannot use a standard carto in an XL tank. You can use a XL carto in a standard tank but there will be 10mm of carto sticking out the top.
Carto tanks also come in different diameters. This only affects how much juice they hold and how they look on your mod
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Nice clear answer!
Seems you can't go wrong with a XL 45mm carto since that will fit in both sized tanks.
Another question: What about tips/mouthpieces for cartos?
The carto's for tanks would usually be steel unpainted, and I imagine many people would need a tip to go on end and not just put lips directly to the steel carto. So I'm wondering if the standard CE4 type tips fit on the inside of the standard carto.