According to a couple of my big GM parts books, the clutch pedal part number is 583360 (Group 0.830). It was used in: 61-63 Olds F85, Jetfire 61-63 Buick Skylark and related (series 40-41-43 bodies) Hope this helps!
someone else on here bought a complete parts car just for the motor/trans - dont know what he did with the rest, but I remember the talk about how rare it was.....sorry, thats all I remember
The Tempest might be close... but in the realm of unobtainium. Look at Nova pedals as well, I know they are re-popped as an entire ***embly. Look at Cl***ic Industries, Year One and of course dirty old evilBay.
Try 4speedconversions.com. I've been eye balling one of their setups for one of my OT cars. I am Butch/56sedandelivery.