Need engine sensor help!

[SCOTI]

Ok, I'm trying to finish up the motor rebuild in my 89 CC dually. It's the original tbi 454 that was refreshed but after it went through the rebuild process, I only got some of the sensors back w/the 'extra' parts.

My problem is there were many underhood wires in a seriously bad state of condition. 2 of the 3 coolant sensors (1 in each head + 1 @ the front of the intake) were really cooked. One was missing the terminal @ the end (driver side sensor), the other (pass side head) has barely 2 strands of wire retaining it.

I've got the technical GM ID info from an 89 service manual & the 3 coolant sensors I've been struggling with are:

1) Auxiliary Cooling Fan Switch (this one is ID'd as the one in the pass side head).
2) Coolant Temp Sensor (this one is ID'd as the one @ the front of the intake).
3) Water Temperature Switch (this one is ID'd as the driver side sensor).

When I hit my local parts places, their search features come up w/the one for the intake & a generic temp unit for the head (Oreillys didn't even list one for the head). They keep telling me to get the same temp unit for the head & just use 1 in each head. My issue w/that is they're ID'd as 2 different items. 2 different items would suggest 2 different functions. To me, 2 different functions usually aren't monitored w/a similar sensor.

Anyone have some possible specific p/n's or specific data sources they can share?