I stay far away from these "aftermarket" parts for MB's. I put new spark plugs in my 190E on Saturday and found the rotor corroded up pretty bad. No place to get one on Saturday around here except AutoZone or Adavance Auto. I bought the rotor for $5 from Advance and it ran exactly 3 miles before a BAD miss set in (almost got me killed going back across a busy highway). Needless to say I cleaned the old one with fine emery cloth and immediately reinstalled it. I had hoped that their parts had gotten better, but this is obviously not the case. As hard as the CPS is to get to and considering how bad it can leave you stranded, I wouldn't cheap out on it.