Okay have 2 trucks with the "new style" rear axle. The new style axle is a non removable 3rd member type. The old style is just that, and you adjust the carrier bearings with the spanner nuts or what ever you call em. The new style is a spreader bar or hammer in the races and shim type, like most modern rear ends.
Anyway the cables Red58 linked to, the more costly one is the rear cable I got 2 that look just like that. Won't work on the new style rear end. The new style has some metal flanges that bolt to the brake backing plates, and I think older 50's trucks did that same sort of thing. I guess the new style is the Spicer 45?? So Longbox55, how long did they use this axle? Will newer cables work?
