Headlight removal

You've probably done this but do you have the ignition switch to at least "ON" position and moved the lever one click down?
And if your fuses are all good then yes, it's probably the bulbs.

 

Not sure if they are similar to my 328 but it is an easy process on my car. First turn the headlights on and remove the screws on the painted housing then you can remove the screws that hold the headlight in place. Mine had 3 screws that held it in place and aligned it as well. The headlight should pop out and be easily disconnected. If you are going to be messing around in there I would suggest disconnecting the battery as not to have the headlamp assembly return to its original position and cut off a finger or two. It seems odd that both would go out at the same time. I believe yours our sealed beams as mine were and you cannot just replace the bulbs you would need to replace the whole headlamp.

Have you checked the fuses?

I replaced my headlamps recently with new housing and H4 bulbs. Dramatic increase in output of light for about $150 bucks.

 

You'll have to remove the four screws off the top of each of the lamp pods for access to the bulbs but they're probably sealed beams. Mine were and both burned out at the same time. Replaced them with modern bulbs and lenses. Do the full beams work?
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There is a relay that is used to lift the headlight pods. It is located, on my 328, near the passenger headlight pod under the bonnet. I believe it is only a fuse for the headlights to work. Check your fuse on the dashboard on the passenger side of the car.

 

There are actually 4 relays involved. Master lifter, rh lifter, lh lifter, and another independant relay for headlights and parking lights. If you are changing lights, not a bad idea to change relays as well.

Right Fuse block...first four - A and C are right headlight high and lowbeam. B and D and are left high and low.
Left Fuse block...G is lifter bucket motors. None are dependent on the ignition switch.



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Ferrari Wiring Diagrams - http://www.ferrari308gtbi.com/