need help with stepside fender marker lights

[FL71C10]

I am putting my stepside bed back together. I am putting new marker light "cups" in (the part that the light socket sits it, and I am trying to find out if the hole for the wire should be in the back or the front. I would think the back, but maybe someone could take a pic of their for me? Here's mine so you understand what the #$#% I am talking about.

My current fender has the 68 reflector "cup" or "pocket". I'm going to switch those out for ones from a later model with the hole. One is rusty anyway and needs to be replaced. So I just want to know if the hole for the wire should come out towards the rear of the truck.

Thanks!