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No clue but auto zone will have replacement copper washers in stock. Really, they are reuseable you just have to anneal the used ones. Easiest way is heat them on an electric stove burner until dull red and let them cool naturally.

Mine are and his injector line washers are, so annealing applies to both.

Somehow my comment got misplaced but, I anneal any and all of my copper crush washers and re-use them. Easy to do. Just heat them to dull red and allow them to cool naturally. Copper work hardens but is easy to soften again.

Never replaced one in the last 20 years. I just anneal the old one and reuse it.