I just finished making this last week. It was turned from a chunk of walnut that was left over from another project and topped with a shift pattern medallion (designed to fit some Volkswagen or other) sourced from e-bay. The original plan was to make this knob as a prototype and then use the lessons learned making it to turn another from a more exotic wood but this turned out so well I think I'll keep it. Obviously, the replacement shift boot has yet to arrive, I don't want to cut up the OEM knob's boot least I decide to reinstall it in the future.
cheers - dj
p.s. - You get extra points if you noticed the knob is attached to one of Ben's ball bearing short shifters!