Fan clutch replacement guidance and recommendations

So what's the distance from the rad to the blade tip ? The Hays unit I got said 3/4 inch

Judging solely on how it looks in relation to how deep the fan sits in the shroud , it’s basically in the same position as the factory Eaton unit that was replaced.

I’ll have to measure it next time I’m around the car. It’s stored an hour away in a shop where I’ve been working on it