The bearing in the fan is shot. where can...

Find someone who sells this make for a direct replacement. Otherwise ww grainger and many other hvac repair companys with carry a replacement. Get the hp,voltage,amps and direction it turns. measure it to make sure it fits and mounts the same. Also some replacement motors has 2 wires for the capacitor so get new one and don't try to wire it to old capacitor. Most are duel porpose on new units and will run fan and compressor. Some new motors have the option to us only one brown wire for duel cap but make sure you use the correct brown wire one is solid and one with have a white stripe if it will work both ways. Also make sure Cap MFD matches new motor.