Genuine Nissan S15 Silvia gear knob, complete in box. This item has the lower lip designed to fit inside the boot for a neat finish. This is the later model with the "S"

This only fits on the S15 6 speed transmission gear lever. The s15 has a 12mm shaft unlike the 10mm shaft found on most other Nissans. A skilled craftsman would be able to adapt the knob to a smaller shaft.