Hi Need some help. Thinking of changing my wheel rims. But know nothing about the sizing and do not understand what the ET is on a wheel so need your help please. My car is a c250 Estate on a 14 plate, which I believe is a W204. I have taken a wheel off and the following is inside. ET 58......8.5J x 17 H2 Merc part number is A2044012400 I am looking to buy the following Aspect Ratio is 40 + 45 Rim Width. 7.5J & 8.5J The tyres on both set of wheels are the same size, just worried about rims. So please tell me if they will fit my car.. Many Thanks in advance.