We are always looking for OEM MX Cylinders, If you have any old cylinders laying around please contact us with what you have. Email us at mcb@mcbperformance.com with photos of the Cylinders. The Cylinders can not be Sleeved, the easiest way to check is to put a magnet in the cylinder and if it sticks it is sleeved. If it kind of sticks it is plated and we would be interested in that cylinder. The cylinder can not be aftermarket. If the Cylinder is a Good Core we will buy it from you. We are Not interested in MX crankshafts, However we do buy Snowmobile crankshafts and cylinders.