Probably obsolete. Could try matching it up to a newer one. I would change the whole unit. You might be throwing good money after bad but otherwise pull the motor and go to an HVAC supplier and see if they can match it up. IIRC They were the same one used in old window units.
Do you have the owners packet that came with it that has all the manuals for the appliances ? Most of the Older Travcos had 9,000 btu Polar Cubs.
Too bad my father isn't around anymore. He was a factory authorized service center for Coleman and Dou Therm and Mark IV for Travco.
1975 Travco 270
1974 Travco 220 Parts unit