The Hole In The End Of The Top Bed Rail??

[jim-bob]

This is the only way I know how to describe it..them. On my 67 stepside i'm wanting to put lights in these holes at the end of the top rails above tailgate..If I'm making since I would like to see what other folks have done with these holes besides leave them original..I see plugs that can be installed and i see lights also..I'm definately gonna put lights but haven't decided if they will be turn signals, back ups(remove ones at tail lights) or additional brake lights..
So, if you got'em please let me see'em....Thanks!!