I am going to show you how to change your jack pads that usually are in bad conditions because jacking the car with inadequate jacks and also caused by hits with curbs and garage ramps.
You need 4 of them with the following part numbers depending on your car:
51717164761 for e92
51717237195 for e90/e91/e81/e82/e87
51717169981 for e93/e88