Hi, I'm trying to find the exact type and size plastic used on the ego 510 cartomizer tank that I ordered from madvapes: eGo 510 Dual Coil Tank Cartomizer, 2.5ml. I'm attempting to build my own atomizer and I can't find the type of plastic used
and I need it to be the exact size in order to make it fit flush with my ego battery from what I gathered the dimensions are 9/16 OD 1/2 ID and 1/16 wall thickness but I can't find the exact size 
Also what would be the best type of plastic to use?
Thanks in advance

Also what would be the best type of plastic to use?
Thanks in advance