See it here in this pic? Its the longer straight one on my 66, but may be different on your car for some reason!! Need one of these just PM back and ill set you up!! Geof
I know you want original, but for others, I am pretty sure a later kick-down will work with our cable-shift tranny. At least I grabbed the linkage from a 4 bbl 90's 318 Ram Van. I don't think the kickdown shaft location changed on the trannys and the shift cable shouldn't interfere.
The later linkage is a simpler design. It was a pain getting the bolts into the back of the head on my 1965, with the engine in the car.