Carbon fibre gear knob to fit any K Series engined cars, I didn't make the carbon, but I've turned a bronze insert for them with an M10 x 1.5 thread to fit the gear lever.
I have a few available, insured delivery would be £8.00
The extra weight of this compared with an ally one also helps with the shift.
Unfortunately the pics don't do it justice, the carbon weave is pefect and has to be seen to be believed!