ITEM NAME:1 x Front Knock Sensor For Subaru Legacy Forester Impreza 1997-1999 22060-AA061 Descriptio n Description: product description This knock sensor is suitable for the following conventional models: ((. Actual trigger sensor photo. 22060-AA061 is suitable for the following Subaru model knock sensor is an acoustic sensor that monitors the shock wave in the engine.). Specifications: Material: rubber Colour: Black Size: 22060-AA061 Package Included: Product List: 1X Car Knock Sensor Note: 1.Due to the manual measurement and different measurement methods, the actual size could be slightly different. 2.Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the color tone of the website's photo and the actual item could be slightly different. 1 x Front Knock Sensor For Subaru Legacy Forester Impreza 1997-1999 22060-AA061.This knock sensor is suitable for the following conventional models: ((. Actual trigger sensor photo. 22060-AA061 is suitable for the following Subaru model knock sensor is an acoustic sensor that monitors the shock wave in the engine.). ).