There are two different sets of pictures here, of two different 1966 c10, long wheelbase trucks. The first set is of a stepside, the second set is of a long bed, without a bed on it, so you can see the view from the top and how the cables are routed, with the various guides.
8
pictures - 1966 Chevy Stepside lwb emergency brake cable system
8
pictures - 1966 Chevy lwb emergency brake cable system - different truck,
with the bed removed
Woogeroo Photos @ Yahoo! Look at 1966 brakes folder - diagrams of brake system