There are two different sets of pictures here, of two different 1966 c10, long wheelbase trucks.
The first set is of a long wheel base step side showing the cable routing underneath with the bed still on. The second set is of a long wheelbase fleet side, without a bed on it, so you can see the view from the top of the frame and how the cables are routed, with the various guides.
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pictures - 1966 Chevy Stepside lwb emergency brake cable system routing
More images of my 1965 Chevrolet C10 pickup truck - look at the brakes and underside images