Specifying a genuine factory issued Spring
means that you are buying a Spring
made to Japanese quality control standards.
Specifying only genuine factory springs means you are fitting the same springs that were deemed good enough by the factory when your machine rolled off the production line.
Other springs you may wish to consider:
Genuine factory drive springs means genuine factory quality. Using cheaper parts could be very costly! Consider replacing the related interfacing components at the same time - mixing old with new can often lead to unreliability.