Two plastic parts are leftovers but where from?

I teared my vacuum cleaner (Roborock S7 later model) down (have to change the vibrating module) and in some point I turned it (vacuum cleaner) upside down these parts dropped out on the table. The size of the fallen out rectangular black plastic part is about 13x4x5 mm including some kind of similar notches on it's each end. There are two pieces not exactly the same looking parts but the sizes are the same. I might remember they falled out after removing the main brush module and then when I turned vacuum cleaner upside down there parts falled out. The model is the later one and European (Roborock S7) . Anyone who might know these parts locations in vacuum cleaner would you please tell me?