Help! Stuck rear seat belt on 98 Impreza wagon

Hi Folks,

I would appreciate some help on this.

My 98 Impreza BSW right rear seatbelt is stuck. It seems to have been caused by having 3 child seats in the back seat. It appears the child- seat lock mechanism became engaged (as it should) but did not disengage. We've used child seats many times before with no problems. I removed the belt from the car, and am now searching for a replacement part online (nobody seems to have a used part here). However, the part numbers I type in don't show up. Am I doing something wrong? What I have in my hands is an assembly, which has the belt itself, some brackets, the locking mechanism (where the belt is wound), etc. Some of the numbers are:

None of these show up on any online parts stores I've found. Are these not Subaru part numbers? Please help.

Regards,

Ricardo