When I recently bought a car, I was aware that the HEADREST PLASTIC BACK PANEL was broken and I would either have to buy one somewhere or repair the broken one.
Unfortunately, I couldn't find such a plastic element anywhere to buy. However, on eBay I bought a new BLACK STICH REAR TOP INTERIOR TRIM LEATHER COVER, which is on its way to me from London:
https://www.ebay.pl/itm/351790153253
However, I think that before I put on this leather cover, it would be a good idea to do something with this broken element.
I can either have the plastic welded, I have already found a suitable local company and I also found an instructional video - how to dismantle this element:
Or maybe one of you has such an element from the dismantling of your cars and could sell it?