Those are actually just bumpers, not seals. They're the same for AD series trucks and go on the lever arm that extends up from the pedal pivot shaft up along the toe panel and below where the pedal shafts go thru the floorboard. They go on the Lower Pedal Assembly per the attached pic from the 47-54 Factory Assembly Manual. Red arrow shows the location, although they don't show up on the figure. They were on my truck originally, but pretty deteriorated.
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.