Portable air conditioner part needed

[perc-o-prince]

OK, here's a challenge. It's a Boston Innovative Products portable air conditioner/heater/fan model PAC13KR-342. The plastic squirrel-cage fan for the exhaust broke. The company isn't in business any longer (this unit is about 4-5 years old) and the model doesn't show up in Sear's parts database.

Any ideas??

Chuck