C-X5B-F： This product is compatible with the original X5-15 and is equipped with a smoother power transmission system. It not only delivers a significant improvement in starting performance but also effectively enhances overall transmission efficiency and operating speed, comprehensively optimizing the power output performance of the equipment and bringing a more efficient and smooth user experience.

C-X5B-R：The drive shaft equips the vehicle with a more efficient power transmission system, which significantly enhances the vehicle's starting performance and improves transmission efficiency and speed.
This product is compatible with the original factory model X5-42A.