I have my HL15, and am happy to answer any questions I can!

That’s a tough one, I’m using the passive preinstalled cooler. So I’m not certain without yanking that off, which I’d rather not do just yet… lol.

TechnoTim did make a post regarding here

A few replies up in that post was Hutch confirming the 160mm, though that does say from the motherboard itself, so you might have to add socket height to that.