From the state of the cuts on the trim it looks to me like a retro fit rather than a factory accessory.
In any case it's a Thule (obv)
There are various towbar specialists who "ought" to be able to help you...
https://www.tridenttowing.co.uk/thul...ar-spares-t238
https://www.pfjones.co.uk/volvo-xc90...le-towbar.html
Cheers
Dave