This product includes 6 pieces of pump plunger springs designed for diesel engines.The item is compatible with CAT C7 and C9 engine models, specifically fitting equipment such as the E325D, E329D, E336D, and E330D.These springs serve as a functional replacement to restore pump.The part numbers associated with this compatibility include 319-0678(C7), 319-0670, 319-0677, 319-0676, and 319-0675.The physical specifications of each spring are an inner diameter of 1.3mm, an outer diameter of 8.7mm, and a length of 33.5mm.This component is intended to match the form and function of the equipment for the specified engine types.