The brush set or also called starter carbon is a wear part of the starter that can be easily changed. It can be welded or screwed onto the brush holder. It is important that the entire brush surface rests on the armature commutator in order to fulfill its role. Brushes for Valéo starters are usually delivered in sets of 4. To change them, you have to open the rear of the starter, there are usually two screws, remove the rear bearing and you have direct access to the starter brushes. These can be delivered directly pre-mounted on the brush holder.

You will find the right part via the following link

https://wagendass.com/en/95-brush-holder-for-valeo

In any case to find the right model you need the reference of your starter. You can also use the detailed product sheet to find the dimension. Only the length is unknown since the brushes are worn.