On my 2016 Sport I had to fab up some mounting plates out of aluminum. I then centered everything, drilled a few holes in the plates and mounted the supplied bracket to my plate. The supplied bracket did not fit as you can see from the first picture. Forgot to take pics before painting...
Stillen bracket placed on opening, mounting holes do not line up;
1.jpg
My plate placed on the opening;
2.jpg
Both brackets placed on the opening;
3.jpg
Front side just for ref;
4.jpg
Mounted, pic from the rear;
5.jpg
Front view;
6.jpg
Hopefully this will give you a few ideas, not sure what a 14 Sport bumper looks like compared to a 16.
Good luck!