KitchenAid mixer 8211779/9703671/8212396 gear housing.Genuine KitchenAid Transmission Housing with Magnesium Redesign for 6 Quart MixersFits KitchenAid Professional 600 Stand Mixer Models: KD2661, KT2651, KP2671, KP2671X, KV25HOX, KP26M1X, KP2670Improved Magnesium design provides better durability over the previous plastic designIncludes self-adhesive gasketKitchenAid Replacement Part Numbers: 8212396, replaces old part number: 8211779