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PAC Racing Valve Spring Shim - 0.020 in Thick - 1.500 in OD - 0.570 in ID - Set of 16 Speedo Sending Unit 2007 GMC Sierra 1500 ClassicProduct Description: Valve Spring Shim 0. 020 in Thick 1. 500 in OD 0. 570 in ID Steel Set of 16 PAC Racing Springs is part of the Race Winning Brands Family. With more than 100 years of spring manufacturing experience. We understand the demands of racing and provide a commitment to all of our customers to provide the best service possible. We continue to expand products and offer expanded onsite technical services at various racing events. We believe