I have a '98 GS400 with factory HID and my right headlight turned a purple color for a couple days and then went out. I went to the dealer and they wanted $402 just for the bulb. Does anyone know the OEM manufacturer for the '98 HID D2R bulbs, so I can buy it online and match the other headlight? Also, how difficult is it to replace the bulb myself? Has anyone dealt with this before?