The washers are supposed to be a one time use only. So if they are reused they tend to leak. Just get the size and go to Pep Boys. Look at where they have the nuts, bolts and screws isle. There they should have a big black cabinet with lots of drawers. Open one of them and there should be different sizes banjo bolts and next to them different sizes copper washers. Just fit one that suits your needs.
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