You can find all Mavic spare parts and components at Escapa.
Such as the Mavic Cosmic SLR 32 Disc Aero Front/Rear Spoke
Mavic Cosmic SLR 32 Disc Spokes V4164801 / LV4164800
As used on the 2021 Cosmic SLR 32 Disc wheels, Front and Rear (both sides)
The spokes are black, elliptical aero, steel, straight-pull, double-twist, and come with integrated nipples
They measure 291 mm. Note
The unit of sale is a single spoke; the price is per spoke.