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mcmaster carr and graingers both sell them in every size under the sun. I have a lot of different sizes here what size do you need?

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It's for my 68 Dart, so it's probably the same as what you're using. If you plugged them that is, lol.

There is a Grainger near me, but they said I need an account to buy from them. I don't own a business, so that didn't get me anywhere

EDIT: I just measured it and it's 3/4" ID