Fan clutch replacement guidance and recommendations

From the factory (no guarantee with aftermarket), a heavy-duty fan clutch, along with being of sturdier construction, has an idle lock-in feature: the fan is driven at engine idle, no matter what the thermostatic coil has to say about it. That improves A/C performance and guards against overheating in stuck-in-traffic situations.

Classic Industries is a garbage company selling garbage parts at LOLROFL prices. They're on my always-avoid list.