Here's the Coolant Temperature Switch, along with the bag the new one came inside.
Note the orientation of the electrical connection, and the key.
Apparently, that's what makes it the right spec.
I put that part number into Google and came up with this:
ACURA LEGEND RADIATOR FAN CONTROL SENSOR ASSY. @ AcuraOEMparts.com - Acura Parts from Delray Acura
....only $30.66