If you are not familiar with Ebay, If a guy has 27,580 deals and has a 99.8% feedback, that's better than Chevrolet Truck Division, all parts vendors and The U.S. Credit rating.
I do not know AD trucks like the other guys but would offer this: From what I see there are two "cups" called retainers, these are ends for the spring to be "located" on the shaft. This spring could be to apply pressure on the pedal hubs but allow them to rotate also. The spring may also apply pressure to hold the "Pin Lock"? I don't know what piece has to do with grease. If what I see is true and is supported by the experts, then you now know what each piece does and can proceed to find the exact parts or jury rig it. I do not recognize the type of retainer on the end of shaft. Don't know how the pin lock works, it looks like it's in a groove. If so maybe a standard "E" retaining ring will work.
