But Mad North-Northwest
Join Date: Sep 2003
Location: SF Bay Area, CA
This is the one I bought for my '63 Giulia. It's the direct Bosch replacement for the old electromechanical regulator.
2191 BOSCH Voltage Regulator - 12 Volt
The ones alphil linked to have basically the same updated guts as this one, but they have the old-style casing so they look original. If you don't care about original looks you can save a bunch of money as the new looking one is only $33.
1963 Giulia Spider (1750 engine)
Former: 1987 Milano Gold