Accelerator Return Spring 66 Barrracuda

I am searching for a return spring that fits on the back of the accelerator pedal and connects the pedal to the accelerator rod. The Mopar number is 2806 400. It would fit a 63-66 A-body Valiant, Dart or in my case Barracuda with a 6 cylinder motor.

http://www.jholst.net/65-parts-manual/fuel.pdf has a picture part reference 14-07-15.

Any assistance or ideas appreciated.