Check out this gearbox, http://www.rghelmstedt.de/joomlag/
The only info I can find is this on the site:
Transmission:
5-speed sequential racing gearbox housing in the original Beetle
Ignition interruption during the switching operation
Limited slip differential
I don't think it would be cheap, but how good would a 5 speed sequential gearbox be!
Gracey ·