There are all ways to run a buisness and yes with the exeption like said we also mount customers tires from tire rack. We dont like to use customers parts and rarely do cause of warranty issues. Mercedes brakes are very easy , just depends on customers , do they have time or even feel like hassling with it. I see alot of older cars that DIYers are taking care of. As for late models most customers have had issues with other shops that put a bad taste in their mouth. They like us to take care of the car and make sure of no problems. If I had a customer that was online here and bought the parts from fastlane or another good source then my outlook of using their parts might be different due to them buying good parts and not hi-lo ar auto _zone parts that dont hold up or we have installation problems.