OEM John Deere Part Number 1001899. John Deere Spindle Blade Belt 42” Deck Kit GX20072 UC21583 AUC15811 LA 100 105. OEM John Deere Part Number 1001899 OEM John Deere Part Number 1001899 Please Refer to Original Equipment Owners Manual to verify Compatibility. This product is brand new and will come in original factory packaging. We are proud to be a factory authorized retailer. We use several different carriers and choose the most economical for the item and destination based on the estimated transit time displayed.