I don't recognize the 1st photo, but I know the 2nd photo:
This is under the car and on the passenger side; the rubber hose shown is between the main coolant pipe and connects to the heater core.
This metal pipe with the rubber hose is one GM part and was discontinued since 1994.
'buddycraigg' is suggesting by cutting the rubber hose from the metal pipe and use standard hose clamps.
To me, clean the rubber hose and see if the coolant is leaking
before cutting out the hose....
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Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles