mk1 golf aerial please help

Hi i have the original aerial still on my car…….but its seen better days well i guess it is 30 odd years old, its the screw in black bee string type one i think they were made by Bosch but not 100% i want to keep it original as possible can these still be got any where?
i tried looking myself but found nothing so i brought a beru electric one today from GSF but its the chrome one, does anyone know i can get the black ones from???

many thanks
Langers

Try your local car spares mate we can still get them i work at a car spares or even halfords or a motor world