Wow you really dug up my thread! Hahah... man after my accident this morning that very bulb popped out of its socket!
The Luxeon K2 is very neutral white. It feels like 5500-5700K. The side marker LEDs are regular 5mm, so they're much more blue and leans towards 6500K+. My HID bulbs are Ultinon 6500K.
The picture below is not completely accurate. The parking light bulb is much more white and neutral looking:
If you want to make your own parking light bulbs, I would suggest these:
Cool White Luxeon Rebel 10mm Square LEDs