Timing Chain Kit fits BMW 545i 550i 740i E60 E63 E65 X5 E53 N62B44A N62B48 Engine Code:N62B40 N62B44 N62B48 4.0L 4.4L 4.8L V8 DOHC Package Includes: 4 Timing Chain Rail. 2 Timing Chain Side Rail. It usually takes 24h to handle the order. Otherwise, we will not be able to receive your return. We offer high quality engine components and our product line stands for stability, quality and performance to meet the needs of today's challenging markets. In addition, the main components meet or exceed the stringent standards of QS/9000, ISO/9001, ISO/14001 and IATF/16949. Our gasket line is made of non-asbestos material, the best rubber, stem seal, graphite or MLS (multi-layer steel) head gasket for superior sealing. We will work hard to make sure every customer 100% satisfied and resolve any problem for you.