Do your door windows fall down, don’t stay wherre you have set them, rattle, etc? When you take apart the window mechanism, you may find what I did on mine. The felts the windows ride in are totally destroyed. No wonder after more the 50 years.
Replace those rotten rusty window sliding felts with new ones. Normally riveted in place these new ones will restore the operation of your door windows. This is the Door Window Felt for the rear portion of Door Window. Front Window Felts are also available.