I bought a Wild Cat PK 80. The spark plug boot that came with the kit seems to be the kind that thread in. I couldn't get the boot to snap down on the plug so I unthreaded the cap on the spark plug and the boot threads on. I don't want this though as it makes the boot impossible to remove once assembled. I'm looking for a boot replacement. What do I need to know to buy a boot that just snaps on? How do I differentiate the types when I see them online?