Here you find how to install different parts correctly
These snap in place but you can add a 55mm strip of 10x1mm 3M VHB tape to the bottom face of the U-groove for extra secure installation
Don't push it on straight from above since it requires more force, put the inner edge next to the white covers edge and rotate the fender down like in the video clip.
Clean the surface for the rear wing/fender with IPA
Test mount to get a feel for the location before removing tape backing
Remove tape backing , line up and install and push down to get the tape to stick properly.
Front fender snaps on from above.
Remove all 6 screws
Optionally add new thread lock to the screws
Install wheel cover
Thread in the screws until you feel resistance
Tighten 1/4 turn