Genuine Cummins Diesel Engine Dual Ni PISTON – 3067474, 3074494. These parts came from an old auto parts store that went out of business. They have been in dry storage and I’m sorting through a LOT of parts. Metal parts may have slight surface rust and rubber/leather parts may need to be soaked in oil. Most of these are old parts and may look like old parts that have been sitting on a shelf in a box! Please verify that they will fit your application. I take my information from VERY old catalogs, as well as cross-reference on the internet.