Summary

Front Light Mount
The front light is printed in two parts because PETG tends to break at the clip closure, although it is more flexible in this orientation. This way, everything can be 3D printed without the need for supports. You just have to glue the two parts together with super glue, and it works perfectly. It almost feels like an original part. The bike light mount is attached to the handlebars using two cable ties and a small piece of bicycle inner tube rubber for added grip.

Rear Light Mount
This mount is designed for seat posts 28mm and smaller. By using a rubber piece from an old inner tube, the model can be adapted to fit even smaller seat posts. However, the model doesn't work as perfectly as I had hoped, so I'm including the Fusion 360 file for further improvements. It works, click does not feel nice (but I did not have the original brackets as a reference).

DE: Lidl: CRIVIT LED-Fahrradleuchten-Set mit Notbremsfunktion
Eng: Lidl: CRIVIT LED bicycle light set with emergency brake function

BackLight
Modell: LR-3C / XC-316SP-A

7g Filament
2x M4 (20 mm) Srew
2x M4 Nut
bicycle tube or moss rubber (anti slip)

Front
Modell: LI-5A / XC-362
5g Filament
Super Glue
2x Cable tie 5mm
bicycle tube or moss rubber (anti slip)

It was printed in PETG without any support structures.

My bike was stolen, but luckily the police recovered it. Unfortunately, the thieves removed all my mounts, extensions, and modifications. Now I’m left with a bunch of parts where only simple plastic mounts are missing. It's really frustrating that there isn’t a standard for such mounts in the budget segment.