Hmmmm- - - -it looks like I might have to backpedal a little on this one- - - -that link does show what looks like a floor-mounted pedal that will work, but only with an automatic trans application. What kind of engine is ahead of that "Jetaway"? Those were extremely rare transmissions and were only used for a couple of years back in the early 1960's, unless you're talking about the Controlled Coupling Hydra-Matic that some people mistakenly referred to as a Jetaway. Once the turbo 350 and turbo 400 transmissions came out, most of the transmissions dedicated to a specific carline like the Dynaflow, Jetaway, Roto-Hydramatic, etc. got discontinued.
Jerry