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My '41 110 had the same problem, and it's because the original rubber grommet that lined the hole in the firewall where the pedal stem goes through rotted away and fell down into the engine bay. My brake pedal's firewall hole has an identical grommet which is still in place. If our cars are close enough in age that Packard used similar designs for these areas, then you should have (or may have had) similar grommets around both holes.
I don't think the factory ever used a grommet as such to line the holes. The air and dust seal went on the arm but in normal use was entirely below the holes with the top of the seal resting against the bottom of floor plate when pedal was relaxed. Often new seals were installed incorrectly being inserted so the large end stayed on top of the plate. In other cases, over time the bellows in the seal has cracked and failed allowing the top to separate from the seal and get pushed thru the holes. Either situation almost looks like it is a grommet.
While the addition of guides will undoubtedly help, those suffering pedal arms scraping against the sides of the holes will most likely find a worn bushing in the pedal or else the shaft is worn or usually both. The wear allows the slight side to side movement where the arms can touch the sides of the holes. On some models the clutch pedal seems to be the one most affected because of the way Packard placed the lubrication fitting for the shaft and bushings. Being placed at the inside or brake pedal end, when grease was added then after a short interval grease would be oozing out the brake pedal side and additional grease was stopped long before any fresh grease ever reached the clutch side.
Here is a 47 shaft and I believe the basic design will be similar to most years. There is one long passage thru the shaft with exit holes in the center of each pedal location. If you enlarge the photo and compare the shaft to the white straightedge you can see the wear on one side of the clutch pedal location. Pedal bushings were also worn in this car but not to the extent a new shaft would not take care of almost all of the play. Since new Packard shafts were not available at the time (and no idea if they are even available today) I cut down and with some minor work was able to use a stock shaft from McMaster. Added grease fittings to the middle of pedals between the bushings instead of trying to drill thru the hardened shaft.
