I have on EBay some rare, seldom offered, interior pieces-both door stainless finishing panels and seat back panels left and right, Also the center armrest back panel.
Also I am running a rare NOS Cadillac (these were never reproduced) factory accelerator pedal with rare, and desirable, bezel. While this is of 1960 manufacture, it also fits a 1959. The only difference is in the pattern of the rubber pad. The 1960 has a "depression" for the heel, whereas the 1959 has slots down the length of the rubber pad.
Don't let a worn out pad distract from your car. I have owned these for 9 years, collecting dust and taking up room, and it is time to pass them on to someone that can truly put them to use.
There are other NOS & used 1959-60 Cadillac parts in my "EBay store".