The istick is 21mm wide at the connection. It has a regular 510 connection and an adapter for an ego-type connection.
The 'tanks' for the Kangers that have the 510 connection are 18.5mm for the regular tank, 22mm for the mega, 30mm for the giant.
The mini tanks have the eGo connection and are @14.5mm wide.
The regular tanks will fit well, hold 2.5ml on the 510 threads without an adapter.
The mega tanks will hang over the edge of the stick about 1mm but have 3.8ml capacity.
The giant will hang over greatly but even more capacity - 4.5ml.
The mini tanks will need the adapter and have a capacity of @ 1.5-1.8ml.
The protank is 18.5mm diameter hold 2.5ml.
The protank mini needs the adapter @14mm and holds 1.5ml.
The T3S needs the adapter, is 14mm and holds 3ml.
The Evod needs the adapter, is 14mm and holds 1.6ml
All but the T3S and the Evod/Evod2 are pyrex - although there is an Evod 'Glass'.
If you want one that has better capacity that doesn't stick over the edge get the regular Aerotank V2 or the Genitank.
If you want more capacity and don't mind the 1mm hangover get the Aero or Genitank mega.
eta: Another Kanger tank is the 'EMOW' and oddly the 'mega' on that one is 19mm (instead of 22mm on the other megas) and has a 2.8ml capacity. The regular EMOW is 16.5mm and 1.8ml.