The brackets are different
Oops on the rotation of the square hole... they are the same rotation 1933-34 Pass vs 1935-37 PU.
Photo attached. When placed on a flat surface and viewed from directly above the edge of the 1933-34 Passenger headlight mount will be about even with the edge of the bracket, on the 1935-37 Pickup bracket it will overhang a bit.
Thank you very much David.The '33-'34 versions are slightly higheer, top to bottom.