beamer 1

HI Fokes , I want to buy some new headlights for my car but i need to know if it is facelift or pre facelift , how do i find this out ? I have spoken to 2 BMW main agents and they didnt know so i need your help chaps . My car is a 523i se saloon , the build date is June 2000 and was first registerd on 1st September 2000