I just found this out myself as i was trying to fix my misfires due to corroded spring contacts. i found them at NAPA and was hoping i could save myself the $75 by not ordering a whole new coil pack. I ended up breaking the little plastic piece that the boot slides on to the coil pack when i went to picked it up so i needed to replace the whole **** thing anyway. The corrosion was so bad it weakened the plastic and made it very brittle. But definitely nice to know that you can just get the boots and springs separately should they act up again.