If you are planning on upgrading to a set of Injector Dynamics Injectors, then do it with a set of Injector Dynamic Female Pigtails. These come pre-assembled and ready for you to splice into your current injector wiring without going through the hassle of putting together your own pigtails where you risk the wiring coming loose after a while.
These are sold individually, and they are great replacements in case you have worn, or damaged pigtails. These will work with Denso style injectors.