Bathroom fan blades bit the dust....

Heard crazy sounds coming from the fan the fan the last few days. The blades have become brittle with age and finally started flying off. I have a sprained ankle right now so can't investigate too much. Are these assemblies pretty standard? Is it possible to replace just the blade assembly? I know a lot about the the other fan assemblies but the bathroom set-up, as you know, is a bit different.

Thanks....