Just to clear up all the 'mud flap' talk. You DO NOT get rear mud flaps. They fit small mud flaps to the front and in the boot or frunk you will find a pair of splash guards with sticky pads already attached. These fix onto the front mud flaps to extend them. They do not fit on the rear.
I to initially assumed they were rear mud flaps when i had my car delivered. Though i wasn't going to use them I though it would see what they looked like. I couldn't work out how they would fit, until I realised they are shaped to attach to the front ones. Gave Tesla a call and they confirmed they are to extend the front ones. And by extend, they will be massive and only just above the ground.
Here is a picture of the instructions for them
https://driveteslacanada.ca/wp-cont...esla-Model-3-mud-flap-and-splash-guards-2.jpg