The John Deere 123778 Arm is a genuine OEM replacement part designed for a wide range of John Deere agricultural and industrial machinery. This durable arm, measuring approximately 254 mm in length, 76.2 mm in width, and 50.8 mm in height, with a weight of 1.36 kg, ensures proper function and fitment. It is a direct substitute for older part numbers R26259 and R26259R, guaranteeing compatibility and performance across numerous tractor and equipment series.