My 2c worth; Looking at 'Ford Model A as Henry Built It', there is a complete '28 Tudor 'cutaway' that shows no carpet or covering on 'seat riser'. I have never seen this feature on an original '28-'29 Tudor but Deluxe Tudor for '31 had it. Also seen on deluxe Fordors with carpet on door bottoms. With carpet along bottom panels on these deluxes, carpet also on riser completes right look. The upholstery companies probably just assume it is correct for earlier models.
Has anyone ever come across front or rear carpet in a '29 Tudor.? Some assembly plants must still have had stocks after 1928.