Nut Plate.
Nut used to secure the control arm.

Fits EX90, S60, S90, V60, V60 Cross Country, V90, V90 Cross Country, XC60, XC90

Suspension Control Arm
Control arms often don’t fail on their own, although their associated bushings can break or wear causing a clunk noise when your Volvo goes over bumps or changes speed rapidly—whether braking or under hard acceleration. Control arms can also sometimes become bent, causing your vehicle to pull to the left or right.