There are 2 kinds of evod heads, long stem and short stem. They don't intermix with each other unless you have the little o-ring that fit under the silicone cap that some of those stems come with and still I have reservations on them working properly.
I found the FT evod heads in a protank loose fitting along with their crap coil makes for a bad experience.
Protanks are long stemed and the one shown is a short stem and it won't fit and leak. I ordered some of those evod stems from FT and OMG they are chitty, I estimate I would get a couple/few rebuilds before I rip that lousy plastic plug on the bottom in half.
Buying the protank from fasttech is your option but chances are its fake/cloned or a 2nd in some way and then evod heads that don't fit properly. Spend the couple extra bucks and get a genuine protank and their proper heads for it, it will save you some aggravation and spending twice when unnecessarily and side by side you can see the quality diference between the FT coils and the protank coils.
My personal experience is that the Kanger Evod heads work fine in the Protank and visa versa. In addition Kanger has discontinued the short post for all the bcc heads. They claim absolute backwards compatibility from Evod to PT on their website. Also from my personal experience the Kanger T3S heads work fine in the PT and Evod although Kanger does NOT claim backwards compatibility at this time. I am of the assumption that Kanger will eventually tool for a universal coil for their bcc's.
I rebuild all my Kanger heads and have no personal experience with knockoff's.
I answered the OP's post as they requested. That was which coil to order from FT
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