I bought them from
Super Bright Car LED Lights, LED Bulbs, Halo Headlights, LED Tail Lights in San Gabriel, just east of downtown LA. These guys appear to be the largest LED supplier in LA. Big and comprehensive inventory. I visited the store and it's located in a small office complex. They appear to be very knowledgeable too.
All bulbs are error free, so the check engine light is not triggered.
They have a link that identifies each bulb on my 2004 Boxster, but you can make a selection for your year model.
Lamp Replacement Guide View All Bulbs
Here's the link to all cars bulbs.
How to search the car bulb size and shop LED Lights on iJDMTOY
All bulbs are white.