Emergency brake cable

[Accelo]

I purchased mine from https://www.inlinetube.com
The price is $55.
It was an exact duplicate. Included the rubber grommet and the rubber sheild where the cable rubs on the inner fender. Also included the straps to bolt it down to the fender. It did have an incorrect yolk pin diameter but that was a simple thing to drill out to 3/8 from 5/16. I's possible that detail has been fixed by now.
https://www.inlinetube.com/products/ft435

You can also get a complete set of cables and retainers from them from $169. Much of the time the lower cables are sticky. I would be confirm they are not the culprit on a sticky Ebrake.
I used to drive these truck daily and it our wet NW (Washington) weather they were often bad/sticky. Easy to tell, just unhook the front cable and individually pull on each rear cable with a pliers. The cable should return on it's own.

An we complain about taxes. LOL.