Not sure how to hook up new tig torch

[Rambozo]

There is a part number for a CK adapter with the proper Everlast quick connector for the argon. (SL2-35LG or SL2-35QD) The problem is that the plastic housing from CK is huge and doesn't quite physically fit the front panel on the 210EXT. See Mark's post about trimming to fit.
Your other options are to use a Weldcraft adapter (Q5G-150), and that will require that you re-use the quick connect fitting off your old torch and transfer it to the new one.
Or if you make up a short cable with male and female DINSE, you can use the CK with no interference problem.
There are a few ways to make your combination work, you just have to decide what will work best for you.

Here you can see the size differences.

Weldcraft:


CK:


Everlast has a video on this subject.
http://www.youtube.com/watch?v=xKkbdqI7cw8