1、OE Number: The referencing OE number of this rear brake cylinder are 43015‑0694, 43015‑0099, which is molded and designed depend on the original data, and maintaining the original car model. 2、Fitment: The rear brake master cylinder is a replacement for KLX140 KLX140L KLX140G KLX140R 2008‑2023, for KX250 2021‑2023, for KX250X 2021‑2023, for KX450 2019‑2023. 3、Perfect Replacement: With specifications matching those of your ATV's original parts, this master cylinder ensures the perfect fit and optimal performance for your vehicle. 4、Durable Material: Manufactured with sturdy metal, the rear brake master cylinder pump is resistant to wear and tear, promising long lasting and dependable performance. 5、Simple Installation: The rear brake master pump features a simple, convenient, and time saving installation process that doesn't require excess tools or complicated steps.