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According to original owners, the ball was a black one piece as installed in the GTO/Tempest.
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Maybe according to SOME owners... but I have also spoken to a couple owners who claim differently. Moses swore the melted woodgrain knob in his car was the only one ever in it since day 1 of ownership, which would make sense since if he was into changing shift knobs he would have surely replaced that molten piece of melted plastic that was in it.
Also, when I went to look at that blue Deuce in Ohio, in addition to the original shifter in the trunk, hood tach, and sport mirrors, I also found a 2 piece GM 4-speed knob in the glovebox... making me believe it was always on that car. I DO have a one piece black one on my car currently btw! ( I just still question if it's indeed "correct".)