In my case I had a water pump leaking, not a housing. Some people buying housing and changing housing too when they have only problem with the pump which is unnecessary.

@DIYDime It's not unnecessary. If the o ring on your water pump has gone flat then the 3 o rings on the housing will soon go flat as well. Doesn't make much sense to wait till later to change the housing o rings and have to repeat the process. I fully understand that at the time that it's only the water pump leaking but it would only take the removal of I think 7 13mm bolts to prevent a leak in the near future. What you're showing these guys is an incomplete job.