The felt grommets can be replaced on a Chevy. My '51 suffered from cab mount problems and the pedals wore into the sheet metal at the top of the openings.
The pedals connections to the pivots might be able to be adjusted a bit, but the connections use mating grooves between the parts to keep them in the correct position. See the pic from the Factory Assembly Manual.
I would say that the issue with Jack's pedals are either the cab mounts have sagged a bit (if they're rubbing on the top of the opening, that's a big clue - see the attached pic) or as Jerry said, the pedal bushings are worn (that would likely make them rub on the sides of the openings.)
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
