Genuine GM OEM Lifter Tray Guides: Factory-correct lifter trays designed specifically for GM LS and LT engines equipped with AFM/DOD systems. Designed for AFM/DOD Lifter Retention: Properly aligns and retains Active Fuel Management lifters within the engine block. Set of Four Lifter Trays Included: Includes four OEM lifter tray guides to service one complete AFM-equipped V8 engine. Supports Factory Valvetrain Geometry: Designed to maintain correct lifter positioning when used with compatible OEM AFM lifters. Replaces GM Part Numbers 12669185 & 12669184: Direct OEM replacement for factory AFM lifter tray guides used in applicable GM engines. The Genuine GM AFM/DOD Lifter Tray Guides (Set of 4) are factory OEM components designed for LS and LT engines equipped with Displacement on Demand (DOD) / Active Fuel Management (AFM). These lifter trays properly retain and align AFM lifters within the engine block, supporting correct lifter positioning and valvetrain geometry during normal engine operation. This set includes four OEM lifter tray guides and is the correct replacement when servicing, repairing, or rebuilding AFM-equipped GM engines. Using genuine GM lifter trays helps ensure compatibility with factory lifters and engine block provisions during maintenance or engine service.