Outboard bulbs are 9007's (55/65) and inboard bulbs are 9004's (45/65). In the OEM configuration, only the outboard low filaments burn when low beams are selected and only the four high filaments burn when high beams are selected. Also, the OEM configuration uses a relay for the inboard high filaments, taking a bit of stress from the POS OEM headlight switch.
You will also need a harness for the four bulbs and some minor, non-cosmetic Sawzall work to make room for the extra bulb base.
These lamps really come alive with the
Wiring Harness/Brite Box Combination from Baker Auto Accessories
and the fogs-on-with-high beams modification shown on
this page at the great Dave Fritz site.
Some have even made up their own harness that mimics the Brite Box.
If you're okay with after-market lamps,
ImportVision Motorsport (not too far from you at the west end of the Simi Valley) sells a pair for $210.