please help me find a solenoid for my welder!

I have an old chemetron sureweld 255 AC/DC high frequency start TIG/stick welder. It is a rebadged Miller, moving core welder. The gas solenoid went bad, and I can not for the life of me track down another one. Its the old style, magnetic windings full the spring loaded plunger back. If anyone has a clue as to where I can find one it would be alot of help. thanks