Below are the types and wattage of bulbs on the 2008 Scion xB. Please use care in replacing and do not use too high a wattage... Mishandling of bulbs can result in bursting, shattering, or shorter lifespan.

Headlights (low) - #9704 - 55W - H11 halogen bulbs
Headlights (high) - #9005 - 60W - HB3 halogen bulbs
Foglights - #9704 - 55W - H11 halogen bulbs
Front turn signal lights / parking lights - #1157NA - 27/8W - Single end bulbs (amber)
Front side marker lights -  - 5W - Wedge base bulbs
Side turn signal lights -  - 0.4W - LED
Rear turn signal lights - 7440 - 21W - Wedge base bulbs
Stop/tail lights and rear side marker lights - 7443 - 21/5W - Wedge base bulbs
Back-up lights - 7440 - 21W - Wedge base bulbs
High mounted stoplight -  - 3.6W - LED
License plate lights - 194 - 5W - Wedge base bulbs
Interior light - 28mm - 8W - Double end (Festoon) bulbs (30mm can fit)
Personal light - 194 - 8W - Wedge base bulbs
Luggage compartment light - 28mm - 5W - Double end (Festoon) bulbs (30mm can fit)

very good to know. i search for a while at SL before knowing which bulbs to buy for the license plate, front turn, and reverse lights