This aluminum coolant water engine cooling thermostat housing assembly cover set is compatible with S80 and XC90 models.Part numbers: 8636779 and 31338532.The set is and designed to replace the thermostat housing assembly cover.Before purchasing, verify that the part numbers and vehicle model, year, and configuration match your vehicle.This part is intended for left-hand drive vehicles.For right-hand drive vehicles, confirm compatibility using your vehicle's VIN or detailed configuration. This is an aftermarket accessory.Brand names and model numbers are referenced strictly for compatibility information.