The pump housing itself is ok. That has two tabs that the ring rotates to attach to, and both of those tabs are okay. It's on the ring itself that one of the tabs is broken.
The ring I'm talking about is the gray piece that is between the pump, and the black piece of pipe. If I recall from the initial assembly, this ring is just on the pump to retain the impeller inside. It's just this ring that is broken.
I'm not sure if this is called the volute.