This rocker arm set is designed to fit Cummins K19, K38, K50 engines with QSK NT14 and NT855 part numbers. It is a high-quality replacement for your valvetrain components, ensuring smooth and efficient engine performance. The set includes all the necessary parts to replace the rocker arms and levers, making it easy to install and get your engine running smoothly again. The OE/OEM part numbers for this set are 3044788, 3044788RX, and 180726. It is compatible with various engines and parts, making it a versatile option for your car or truck. This set is perfect for those who need to replace their rocker arms and levers, and it comes with everything you need to get the job done.