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Silicone Bushings for PPE 2001-2016 GM 6.6L Duramax Engine Mounts\u003c\/h2\u003e\n\u003cp\u003eReplacement silicone bushings for PPE 2001-2016 GM 6.6L Duramax High-Performance Engine Mounts. Each purchase includes two sets of bushings for both mounts. Four application-specific bushing hardness options available:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBlue (40A): Smooth Street, ideal for maximizing vibration damping and ride quality for street applications.\u003c\/li\u003e\n\u003cli\u003eGreen (50A): OEM Firmness, replicating OEM firmness for occasional towing and off-road driving without sacrificing ride quality.\u003c\/li\u003e\n\u003cli\u003eYellow (60A): Street\/Performance, perfect for hybrid use, balancing racing and off-road capabilities with street comfort.\u003c\/li\u003e\n\u003cli\u003eRed (70A): Race\/Competition, designed for drag strip and high-performance applications where maximum stiffness and control are desired.\u003c\/li\u003e\n\u003c\/ul\u003e"}