Own a 1979 300sd. Car was sold out of California, Los Angeles on Figueroa St. to be exact. I've made several calls to dealers including one call to the classic center inquiring on my car being FEDERAL or CA. Initially based on where it was purchased one parts guy said it was CA. Last week I was asked for my vin# by the classic center and it was determined that my car was a Federal(49 state). That was determined by the data card which indicated a 491 option(3 digit) code. The classic center stated that it was a "U.S. version". Can someone here, with their expertise, explain the difference and maybe confirm with MB Classic Center that I am definitely driving around a "federal". I need to purchase the correct rotors and brake pads and do not want to play around or play the guessing game. Greatly appreciate the help