Early Maxstar 140 - need correct TIG gun

[mainetek]

I have the Maxstar 140 and have used it for stick welding exclusively. It has the lift arc switch on the front, but no built in selenoid so using argon must be a separate setup.
I want to get the correct gun for this unit and need advice.
thanks

[MinnesotaDave]

By "correct" you must mean that it plugs into the machine?

it's not really necessary though, you just need a generic wp-9 or wp-17 with a valve (to turn on and off the argon) and a power block to clip your stick stinger on.