This Ski Doo 800 reed-valve twin snowmobile cylinder is newly reconditioned reconditioned with a lifetime plating warranty by the plating shop and has the number 923817. It also works for the 923811 in the earlier ZX chassis. Shipping is only in the lower 48; unless you are purchasing through eBay's Global Shipping Program. If you are in Alaska please contact me before purchasing to check on shipping options. Thanks