If they dont fit, just take off the red fins on top and they will
I have the noctua c12- uh D14... it is the 120mm version that uses a 140mm fan (with 120mm hole spacing for hold down)
I also like it a lit, and no need to control fan speed on it it is so quiet at full
Nice job Nip. Like the open bench design, everytime I try going back to a case, it lasts a week or so before I get annoyed at the too high temps.