This guy mentions it at this timestamp but he also doesn't know what this part does. Looks like they are different for each wheel size:

 

Found the part. it is called front knuckle extension:

"The front knuckle is a steering component that connects the steering arm to the wheel hub. The extension provides additional length to the knuckle, which can increase the vehicle's wheel track. This can improve stability and handling, especially off-road. The extension can also be used to accommodate larger wheels and tires."

Part numbers here for each wheel size and left or right wheel:

https://landrover.scuderiacarparts.com/part-finder/landrover/range-rover/oe/482/4809/90049

 

Many thx

 

apparently if you switch wheel sizes this has to be switched too?

 

Yes

 

Is it easy to buy it online? To be completely honest, I usually order parts through my local dealer since it feels safer and more straightforward. Online, I can check betmgm reviews or order some food, but when it comes to more complicated purchases like parts, I’m just not sure if it’s worth the hassle. There are so many options and, honestly, navigating through all the reviews and figuring out if it's reliable can get overwhelming

 

Sherpa2 yes, those things are mud scrapers. I changed my wheels from 23 inch to 21 inch and the new wheels didn’t rotate thanks to them - so I had to learn fast what they were.

It was easy to buy the smaller set for the smaller wheels - I bought mine from LRParts.net but I am sure local dealer parts departments can help. They aren’t expensive.

Newtorr I found that description of the parts, too. From my basic understanding of what the track of a car is I don’t think the description can be accurate - those parts just bolt on to end of the assembly and don’t affect the track.

They seem to align with the brake callipers so their role to prevent mud from building up on the inside of the wheels and affecting braking performance makes some sense.