Long Bed Fleetside Bed Frame bracket question

[biohazardbill]

I dont remember why I had to remove these brackets but I am speaking about the third ones back from the cab, they are not as high as the front two. Looking to mount them before painting the frame and there are two sets of holes that the brackets could line up on.

So my question is do they go on the front holes or the rear, my bed is not here for me to measure.