ALLIANCE LAUNDRY SYSTEMS Door Latch Arm Assembly (F8221403) - Replacement Part for Commercial Washing Machines & Dryers" 或更详细版本： "ALLIANCE LAUNDRY SYSTEMS F8221403 Door Latch Arm Assembly - OEM Replacement Part for Commercial Laundry Equipment, Washers & Dryers" （注：根据Google SEO规范，保留核心关键词如品牌名、型号、部件名称，并添加使用场景说明。原标题中的"Assy"简写改为完整词"Assembly"以提高可读性。）