Here is the typical response to your post, I will say it first so others don't have to.
1. What is the ad/#? Were the pistons bought here? What kind are they?
2. Can you post proof/Pictures??
3. What is the contact info for the seller? (He may want to come on here & defend himself too).
4. What did you pay, when/how were they shipped, etc....
You need more info if you want anyone to take this post seriously...