You know what's funny about those? It wasn't that long ago you couldn't find one! When my brother built his roadster he wanted one, this was 1995ish. He found one somewhere, an aluminum skull at a swap meet but the back half was flat to bolt it to something, it wasn't a shift knob, one of those was NOT available anywhere, new or used. He had the back of the skull built up with weld, then ground it round and had it polished, drilled and tapped a hole to screw it onto the shifter. He also fully polished a set of Torque thrusts, they were one of the only sets we had ever seen. It seemed like it was no more than a month now looking back at least when 50% of the cars at the meets had a skull shifter and or polished Torque thrusts (now the torque thrusts are out of style already).