[dagnabbitt]

I've been doing some more research and keep finding little bits of info that are tantalizingly close to what I am looking for. It appears that in 60-66 trucks this setup was relatively common, and it was controlled by a handbrake next to the gearshift. Picture 1 is pretty much how it goes.

Picture 2 is my trans hump, there is/was no provision for a handbrake - I even removed the rubber boot to be sure - so it remains a mystery to me how the propeller brake was engaged. I am going to have to guess that it was from under the dash like all other 67-68s, using a cable.

I am going to look into the custom cables suggested above, but am wondering if I can get a 60-66 handbrake and make a hole in the appropriate spot to engage it that way directly, no cable necessary. I need to pull off the trans hump or crawl under to see if there is a linkage mounted to the side of the transmission to accept it.