If your 2016and upMx5 is cruising at lower-than-stock ride height, you mayneed this part. The Headlight Levelizer allows you to properly adjust your headlights for better visibility on lowered cars. 2016-2018 cars all had this sensor, in 2019 and up cars you have to look to see if your car was delivered with it. Look at the left hand side of the rear sway bar, if there is a lever there then you need this levelizer on your lowered Mx5.