The John Deere AM121970 is a genuine OEM flat idler pulley designed to maintain proper belt tension and alignment in John Deere lawn and garden equipment. This high-quality replacement part ensures reliable performance and extends the life of drive belts. It is commonly used in models such as the 160, 165, 170, 175, 180, 185, 240, 245, 260, 265, 285, 320, GT225, GT235, GT245, GX255, GX325, GX335, GX345, GX355, LX172, LX173, LX176, LX178, LX186, LX188, LX255, LX266, LX277, LX279, LX280, LX288, LX289, SST15, SST16, SST18, X300, X304, X305R, X310, X320, X324, X330, X340, X350, X350R, X354, X360, X370, X380, X384, X390, X394, X500, X520, X530, X534, X540, X570, X580, X584, X590, Z335M, Z345M, Z345R, Z355R, Z375R, and F510. Crafted to John Deere's specifications for a perfect fit and optimal function.