Ok I dont know alot so bear with me.. I have rc 550s on my 97 gst. I was told that when they were put in the spark plug wires had to be upgraded and were by the previous owner. Well my far left one busted in 4 peices and idk what to buy. They say bosch premium something layer 7mm. now here is what is weird. I started it to see how it ran on 3cyl for curiosity reasons and shut it off quick obviously it ran ruff. However the pieces that broke apart were the rubber boot the aluminum or w.e piece that connects onto the top of the plug, the wire, & the hard plastic piece broke off from the boot .. the wire was actually just hanging inside rubber boot and I coul just pull it out if I wanted to. However I pieced it all back together kinda just stuff the wire down some didnt try to connect it because Idk how to idk how it actually connects and plut it all on and the car runs smooth? wtf? thats my other question. Im kinda wondering how a spark plug wire and shit works now if someone can kinda explain but also if someone can sell me one wire i need for temporary or if someone can point me in the right direction to replace them all because I guess they only come in sets.