The splicers are a kinda brand name for them, ngk makes them. Snip the wires, tighten to old, stick new in and tighten. Don't take it the wrong way but that is the kinda stuff you use the search bar for. It helps to not derail the build thread/clog it up unnecessarily.
Good luck with the labels but it will serve you better in the future to just learn the wiring colors. It is pretty simple anyway, just match your colors lol. Unless you are colorblind, then its a b!tch