This JUST happened to me. I just finished body work and paint. Had to get a new-to-me grille and when I put everything back together the steering shaft ripped a hole in the lower radiator hose.
Solution: redrill the mounting holes on your radiator 1/2 in to 5/8 in below the existing ones (hat tip to lumpygrits).
Not sure why the new grill holds the radiator lower, but it did. I never had that issue with the old grille.