I hunted quite a bit for the correct shifter ball for my GSX and realized that no one makes the correct knob. 68-72 4 speed cars with a console used a plain shiny black knob with no shift pattern because the shift pattern was in the console. The only ones I could find were a dull black with a raised seam around the middle. The other had an insert that fit a bigger insert and moved around. No good as it often was pulled off when shifting. I found an OEM supplier and had a few correct units made. These are as good or probably better than NOS as they are new. Also made in USA!!! They are correct size and have a single insert that fits the original Buick Hurst shifter with 3/8" 24 fine thread. Most other GM used course thread. They also come with the jam nut. I have three new units for sale for $40 each. I need to find some good size boxes and plan to ship priority so shipping has not been determined yet. Most likely around $6 extra. If you are sick of your old beat up or incorrect unit. Here it is. This knob also has earlier Buick and some Olds applications. You do the homework on that.