That is the "T" mast (very common to Baltimore cars). With 500,000+ 69 Chevelle units produced over 6 plants, I'd have a hard time saying definitely what jack should be in the trunk of your car. Without knowing production suppliers and vendors, that would be a tough call. If it fits and it is dated right, I'd use it. As I mentioned earlier, original Framingham cars that I have seen had the square shaped mast.
Maybe some other Framingham Chevelle owners will chime in here.
Phil W.
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