Help needed ref parts for 6 series windbreak

[rover75golf]

Hi I have broken a part on my windbreak (6series convertible original BMW windbreak) and am trying to locate a replacement ? Does anyone know who makes these windbreaks and /or who I can contact to buy some spares? Tried the web and bm dealers but no luck so far. It’s only a little bit of plastic and as you can see the glue repair didn't work !
Any help or ideas appreciated thanks