It does have a flange, and I'm pretty sure it's an XL.
These are the ones I usually get: Single Coil XL Tank replacement 510 cartomizer for 3.5 and 6ml SmokTank XL - w/flange and 1, 2 or 3 holes.
ETA: I use 70pg/30vg, so 1 or 2 holes work for me. I'm not sure about 50/50.
In my signature is a link to a video about 'Hot Swapping' a carto tank. The method will not work with a tank that has a designated bottom cap, but the video will give you an idea of how a SYM/tank tool works.
Last edited: