This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
This is the Strut Brace Mount with Bushing, Volvo calls this a "Upper Torque Rod Bracket" - It is recommended that both sides (Left & Right) be replaced at the same time. Left side = Part number 8666205, Right side = Part number 8666204.
Volvo Service info recommends replacing both left and right strut braces at the same time. Left = 8666205; right = 8666204.