Most newer bolts do not have that copper crush ring, if it's not leaking at top of bolt, you don't need one. My '82 240 needed one, I was unable to locate a copper one, used a composite instead, "#30 cap thread gasket stock no 35566B" that I got from my local hardware store, doing fine. The "o" ring, regular rubber #9, I think should be there. They are different sizes, the "o" ring fits in a groove machined into the bolt, the washer fits to just below bolt head.

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83 SD

84 CD