Fender Precision to Jazz Bass Conversion Neck Maple manico di basso
But beware, this neck is NOT plug and play.
The nut has marks to indicate where the strings should lay, but the actual string slots have not been added. You will need to file your own, or have a luthier do it for you. Also, the orangeish coating on the neck is visible on the sides of the frets. So if you want nice sparkly frets, you will have to clean off the excess finish yourself.