Hi,
I'm not sure if you made progress on this. It has been a couple of days since we heard from you. Regardless, the housings you referred to are the thermostat housing and the water outlet housing.
I attached two pics below to help you identify them.
I hope this helps. Let me know if you have other questions or if there is something I can do to help.
Take care,
Joe
See pics below.
Images (Click to make bigger)
Monday, July 12th, 2021 AT 9:08 PM