I agree with Bear that the factory shifter is a Dual Gate, but it is a PITA. I did install a Dual Gate in my 69 with the factory console. I used a Hurst Dual Gate made as a drop in for late 70's Camaro and Firebird factory shifters. It is identical to the GTO dual gate, but no neutral safety switch and the handle is curved like a four speed handle. I had to make some spacers to raise it up to the same height as the old shifter. The stock cable will bolt right up to it with the same clips and pins. A 68 GTO shifter bezel fits like a glove in the console, it looks factory. I bought two of the shifters for under $150, but I see the price has gone up. They are still cheaper than factory GTO shifters.
"F'n" stuff up since 1990!
Some are engineers or fabricators for a living, I do it as a hobby.