['68OrangeSunshine]

I had an LMC Cable like that.
I had to pry off their under rated china clamp and re-intall the OEM clamp from the broken cable. Both popped open with a 1/2'' steel chisel.
To get the pin thru the clevis -- you have to line it up with the hole, then put the small end thru the hole from the left with both holes in the clevis straddling the pedal attachment, then pin it with a cotter pin.
Then bolt the old clamp on the new cable to the pedal assembly.
It's a lot easier if the under-the-body end of the cable is left unattached until the pedal assembly is secured to the cab.
Then connect the pedal cable end to the main brake cable system.
You may have to re-adjust the throw of the cable tension by letting it in-or-out on the threaded rod. There's a hole in the threaded rod for the under frame spring. Re-attach the spring and test for tension -- E-Brake Pedal height. Set to personal preference.

LocDoc had the 2'' retract spring for inside the Pedal Assembly.
Wes at Classic Heartbeat had OEM underframe retract springs.