Spark plug wire install, I messed it up... Options

[6strngs]

right, so I was attempting (attempting being the key word) to change my spark plug wires tonight, and there are these plastic things that hold the end of the wire onto the distributar cap. yeah, well I broke them while trying to get them off. so now the ends of the wire fall out of the dist. cap. anybody know where I can get more? and instruct me in how to remove them without breaking them. and tell me what they're called, if you could. thanks