R99963103690
The d2s is an hid lighting. It is an arc source type of lighting available as an upgrade feature in new vehicles from dealers. The white output, and the reflector design system, tend to give it a bluish/purple look. When replacing the xenon bulb, both must be done at the same time. The xenon bulbs change color with usage & time, hence the reason why one bulb will appear yellow & the other 'blue'.
911 1995-98 litronic headlight bulb
911 1998-04 litronic headlight bulb
911 2001-05 litronic headlight bulb
911 2005-08 litronic headlight bulb
Boxster 1997-09 litronic headlight bulb
Cayman 2006-08 litronic headlight bulb
Fitment: SEE DESCRIPTION
S99963103690
"Sylvania Headlight Bulb - Xenarc Hid - Xenon"
T99963103690
"Heliolite Headlight Bulb - Xenon Hid - Xenon"
V99963103690
Jahn Xenon Bulb for Porsche 911, BOXSTER, Boxster, CAYMAN, Cayman