Good thread on the topic from Jim Gerock way back when:
You can retrofit the bottom section of your old style shift lever with the newer style lower parts. I just rebuilt a lever from a '76, but the idea is the same for an older style shift lever. The upper threaded piece where the knob attaches are the same. Also note that I've found that the common "short shift BMW Z3 lever" is a little wide to fit in the IE dual shear thingy, you would probably have to sand down the sides of the bushing a little to get a nice tight fit. Stock lever fits fine. Good luck