[unclebrad]

This one would be a little better than the one I got, because it includes one of the ends that I had to make myself. The under-dash bracket is all you would need to make.

Lokar EC-8001U Connector Cable for Foot Operated Emergency Brakes with Black Housing.
Cable length 6 ft long. $140
https://www.amazon.com/Lokar-EC-8001.../dp/B000CONKBU
https://67-72chevytrucks.com/vboard/...1&d=1701280437

Here is a template for the under-dash bracket I made from 2" angle stock. (Maybe a bit on the heavy duty side, but that is what I had here.)
https://67-72chevytrucks.com/vboard/...1&d=1701280494
https://67-72chevytrucks.com/vboard/...1&d=1701280494
https://67-72chevytrucks.com/vboard/...1&d=1701280494

https://67-72chevytrucks.com/vboard/...1&d=1701280698