Check this out, direct from Sylvania's website...

http://www.sylvania.com/ConsumerProducts/AutomotiveLighting/LampReplacementGuide/AutoLRG-Results.htm

I put in 1990 VW Vanagon and got a list which includes the
Silverstar Ultra

 -tim

90 syncro westy
gilbert, az
http://www.timschneider.org

1990 VOLKSWAGEN Vanagon

High & low beam headlamp
9004
9004SU Silverstar ULTRA for Ultra Night Vision - The Whitest and
Brightest Halogen
9004ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
9004XV XtraVision Halogen - The Brighter Light
9004CB Cool Blue Halogen - The Whiter Light

Parking light
7528
7528LL Long Life Upgrade: Up to twice the life of the standard lamp

Front turn signal
7528
7528LL Long Life Upgrade: Up to twice the life of the standard lamp

Rear turn signal
7506
7506LL Long Life Upgrade: Up to twice the life of the standard lamp

Tail light
7528
7528LL Long Life Upgrade: Up to twice the life of the standard lamp

Stop light
7528
7528LL Long Life Upgrade: Up to twice the life of the standard lamp

High mount stop light
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp

Fog/Driving light
H3-55W
H3ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen

License plate
5008
5008LL Long Life Upgrade: Up to twice the life of the standard lamp

Back up light
7506
7506LL Long Life Upgrade: Up to twice the life of the standard lamp

Front sidemarker
3893
3893LL Long Life Upgrade: Up to twice the life of the standard lamp

Rear sidemarker
3893
3893LL Long Life Upgrade: Up to twice the life of the standard lamp

Dome light
6411
6418
6418LL Long Life Upgrade: Up to twice the life of the standard lamp

Step/Courtesy light
6411

Instrument-general
6411
PC74