I purchased these parts used from a friend. All I got with the purchase was the flywheel, and the clutch. When I look at the kit online, it shows a throw out bearing, pilot bearing and seal as well as what I got. My question is do I have to have these to install the parts that I have or do I need to contact Tripoint Engineering and buy them. I would be happy if these would install using some of my stock parts, only if this wouldn't hurt my car.