Thanks for the replies,
I'm a bit confused at the diameter thing, I took a ruler to it and it turned out to be about 4 mm. Now I did a search on digikey.com (I just did a general search because 4mm was not an option), and they all seem to be 2.1mmID-5.5mmOD...whatever that means. They aren't listing what voltage they are or anything like that so I'm just assuming it's like a universal thing?
The good thing is they are only like $0.70

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