Seadoo Cylinder with pitston It is standard size bore, ready for a re bore, Out of a 92 GTX 580, May Fit Other Models As Well, Good Shape, PLEASE ASK QUESTIONS PRIOR TO BUYING, REFUNDS ARE NOT GIVEN ON POST AUCTION QUESTIONS, IF YOUR MACHINE IS NOT THE MACHINE LISTED PLEASE ASK IF IT WILL FIT, REFUSAL TO NOT PAY GETS YOU AN UNPAID BUYER STRIKE.