Updating lamps

[Hocky]

Car is a 1994 C180 Euro model. The front blinkers have been changed to white, but the side and rear complete assemblies are originals. First, where can I buy these at reasonable prices making sure that they will fit my car perfectly and secondly how can I remove the originals and instal the new(smoked) ones without damaging anything? Will the side ones have any problems with the paintwork area uncovered as they look smaller? I don't think the car has had any respray around the lamps with masking tape, even if it has, there is no visible line around the side lamps. Thanks blokes.