Spacer for Alternator charge post

[s14sliding]

What is the exact name for the spacer in between the body of the alternator and power wire on the wire harness. I need to get on so I don't ground anything out when I turn the key. Stupid question I'm sure but I can't find anything online to buy. I know is either like plastic or rubber. I think lol

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[s14sliding]

Here is a picture of what I'm talking about guys. Wondering what goes in between the wire and body of the alternator on the charge post. 65839

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