The only large scale production relict of the Agfa/AgfaPhoto plant in Leverkusen is the film base department. They still offer tri-acetate film bases. This department is now called `OpCo GmbH´. (PET bases are still produced at Agfa in Mortsel.)
You could also inquire at `Filmotec´ in Wolfen. Beside from manufacturing PET-based camera and print films, they offer leader-films based on acetate and PET.