NO mounting holes for the lower 3 holes of the nose cone.
I thought the lower holes in your photo looked like the ones that you need, but I think you're trying to tell us that section has been cut off clean and that's the nose cone itself...? If that's the case then yeah your tabs are simply a bit too high, where the nose cone is currently hanging is about the right spot (it angles down at the back more like that too).
Wrong radiator completely here but might give you a better idea of proper position of the mounting holes (not of the radiator, this one sits much higher than normal, would usually barely clear the middle hole)
Front and rear views if they help (probably not much)