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Why are there 2- different styles of plastic jacket zippers (MZ_) and sliders (ZS5N_, ZS10N_)?

YKK is discontinuing the old 5V and 10V sliders and zippers. These are being replaced with the 5VS and 10VS (“w” shaped) sliders. Some of the more popular colors are no longer available. Unfortunately, The 5V and 5VS are not interchangeable (same goes for the 10V and 10VS). If the correct slider can not be found to replace a worn slider on an existing zipper, the whole zipper would have to be replaced.