If your clone didn't come with a stainless steel tank the only options are to buy another clone that comes with the steel tank, or to buy a tank section directly either from intaste.de or the original Erlkoenigin site.
My first clone didn't have the steel section either, I purchased a second and third one both had steel tank sections and drip tip adaptors.
There are two threads about the Erlkoenigin original and clones here:
Rebuildable Atomizer Systems
you can get a lot of information just by reading, tho you do need a few more posts before you can ask questions over there.
Hope that helps a little.
