good parts or bad parts

[Kranz]

Well need some hellp in finding out where to get good parts at a cheap price. Well I am going to be rebuilding my 90 tsi awd do to a valve in the piston. I am trying to find a good brnd of pitons that are OEM . Could get a set of used pistons but would rather get new set. I was looking around and found sever brands but don't know them or trust them. Like npr.pistons and rings. Any good for OEM or not? Would like to know your guys in put on this. O and g1pistons or g2 to go with what is the pros and cons of this.