OK - I have a cirrus tank ( Old Glory -custom flag tank from ultravaping site - their "weekly deals" section)
It is 1 3/4 inch tall. Can't find my mm rulers.
I bought from myvaporstore - Single Coil 510 DCTank Cartomizer - 5 Pack for 10.50 - found in their Cartomizer &
tanks section.
These are 45mm.
They fit together perfectly.
tanks have a web site - surricvapes & a link there for a facebook page that you can contact them directly.
Kind of frustrating that soo much of this stuff & websites selling products, don't provide basic & necessary information or
directions. I get almost all of my answers here.