I'm not sure what differences there may be, or why. I'm not qualified enough on those old 4-jets. You'll need to reach out to someone that is more experienced in older Oldsmobiles. I'm just a glorified parts guy that buys and sells old car parts as a hobby. I'd bet there is a club or web site that can help you figure why yours may be slightly different. Good luck.
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John Brown
This isn't rocket surgery.....
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