71 Parking Brake Cable Install

[nibs]

Hey guys, Im having a hard time picturing how this works... I bought some rear section cables for my parking brake system, and they came not looking like I am seeing on my truck.

I removed my trailing arms and the only way I could get the brake cables off was to cut and replace due to the extreme amounts of corrosion.
The new cables look right on the forward end that goes into the mount, however the rear section(after the sheathing) has a long spring and the ferrule. I dont see the spring on the cables that are currently installed.

Does the spring go internal to the brake drum? Just trying to get this figured out before I go in and so some investigative surgery!

Thanks