Fan clutch replacement guidance and recommendations

Here is what I posted before.
If need be I can look in my folder for clutch fan and radiator - I think thats where my notes are.
Mattax said
Hayden 2947, Thermal drive.
View attachment 1716163536

View attachment 1716163537

edited my earlier post again.

Found this:
If my notes are correct, the Hayden catalog showed.
1968-73 340 => 2707 thermal, 17107 non-thermal, 2747 Heavy duty
1968-73 318 => 2706 thermal, 1706 non-therrmal, 2747 Heavy Duty
Click to expand...

Keep in mind my focus was 1967-69