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I would say any 73-77.5 highboy with an FE C-6 combo should work. Also I believe there are aftermarket cable set ups that will work also.
Edit: I can't think of any reason why any truck FE C-6 combo wouldn't work because the distance between the C'6 and the carb is a constant the only variable is the fire wall
It looks like this outfit makes a reproduction but a bit pricey. http://www.kickdownrods.com/shop/196...n-kickdown-rod
If you use the info from that lihk above as far as years and motors and place it in the want section of the forum as well as try those advertising selling 73-79 parts I'm sure you could come up with one cheaper.