Replacing the rear brake discs and rotors on a 1991 500SL. Is this a possible DIY job? Any special reason why a dealer would have to do this? My dealer wants $450 to do this job, but pricing out the parts is ridiculously less than this.

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2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special