Thanks for all of your input guys. I have good pictures and all #'s off the piston and I will make sure they are the same bore. I've yet to refund him his $ but plan on doing it this weekend to avoid the negative feedback. Problem I am sure I'll run into is do I refund him his shipping both ways ? I am already out ebay fee's but do I bite the bullet and be out another $60.00 on the all the shipping ? I feel giving him his $300.00 for pistons that he just decided he didnt want is more the good.