Hi Bigtonka, The 3 holes in front are for bolting to the running board, the remains of the tab above the 3 holes is to bolt the splash apron to the fender,(that tab is part of the apron) it goes between the running board and box.( I see from your pics that you have the splash aprons still on the running boards) the tab at the back/bottom of the wheel opening is for a fender brace, the holes on the rear side may have been for a non stock light. I"am not sure about the crack at the lower back of the fender. I have a 1949 1/2 ton that I just finished installing new rear fenders,running boards, and splash aprons and saw nothing there but I will check tomorrow.
