Adjustable tie rod adapters

[LM7_67]

I'm looking for the taper adapters to convert to adjustable tie rod ends. I know Speedway Motors sells these:

http://www.speedwaymotors.com/Adjust...Heim,3333.html



But they only offer them for '79 and later GM and for Ford.

Does any one know where I can get something similar for my first gen?

Thanks!