I stumbled across this guide:

Low Beam Headlight Bulb Size: 9003/HB2
High Beam Headlamp Light Bulb Size: 9003/HB2
Parking Light Bulb Size: 168
Front Turn Signal Light Bulb Size: 7440
Rear Turn Signal Light Bulb Size: 992 (7440A)
Tail Light Bulb Size: 7443
Stop Light Bulb Size: 7443
High Mount Stop Light Bulb Size: LED
License Plate Light Bulb Size: 168
Back Up Light Bulb Size: 921
Front Sidemarker Light Bulb Size: 168
Dome Light Bulb Size: DE3175
Trunk/Cargo Area Light Bulb Size: DE3022

At this site
http://www.modifiedlife.com/2008-sci...lb-size-guide/

 

Here's a slightly biased guide from Sylvania (promotes their products, lol)

2008 SCION xD

High & low beam headlamp
9003/HB2
9003SU Silverstar ULTRA for Ultra Night Vision - The Whitest and Brightest Halogen
9003ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
9003XV XtraVision Halogen - The Brighter Light
9003CB Cool Blue Halogen - The Whiter Light

Parking light
168
168LL Long Life Upgrade: Up to twice the life of the standard lamp

Front turn signal
7440
7440LL Long Life Upgrade: Up to twice the life of the standard lamp

Rear turn signal
992 (7440A)

Tail light
7443

Stop light
7443

High mount stop light
LED

License plate
168
168LL Long Life Upgrade: Up to twice the life of the standard lamp

Back up light
921
921LL Long Life Upgrade: Up to twice the life of the standard lamp

Front sidemarker
168
168LL Long Life Upgrade: Up to twice the life of the standard lamp

Dome light
DE3175
DE3175LL Long Life Upgrade: Up to twice the life of the standard lamp
7443LL Long Life Upgrade: Up to twice the life of the standard lamp

Trunk/Cargo area
DE3022

link: http://www.sylvania.com/sylvania/Templates/Detail/AutoReplacement_Start.aspx?NRMODE=Published&NRORIGINALURL=%2fConsumerProducts%2fAutomotiveLighting%2fLampReplacementGuide%2f&NRNODEGUID={7A0B9B8E-E8D8-4E08-97CD-220CA5447557}&NRCACHEHINT=NoModifyGuest

Most vehicles are listed there

 

NICE !!!

GREAT POST !!!

This should go to the tech section.

 

Now, has anyone replaced their dim dome light bulbs with one of those 20 LED strips from


http://www.oznium.com/led-dome


And I wonder, do they fit as well in a xD as they do in a xB?