Need outer sill for MK1 cabriolet GTi 1989 - plus screws, nuts and clips for Karmann

Hi, does anyone know where I might get an outer sill for a MK1 cabriolet GTi 1989 - also need the clipper/Karmann screws, nuts and clips . Thank you

Now sorted for sill, screws nuts and clips. But need the sill trim beading in black or dark grey.