hi
they use a D2S bulb, thats all you need search for
oe ones were osram, Ive fitted 8k colour ones in my STR, there brighter and got a blueish light to them, far better
cheap ones are just as good as dear ones, as there all made in china any way, had cheap ones in mine for over 7 years
also might not just be the bulb, could be the ignitor, bit on back of the bulb or ballast, bit on side of headlight, they also fail
as said above anything upto 30000 volts to get them strike
also on my STR you have to remove the headlights to replace the bulbs, as theres not enough space in the engine bay, which means the front bumper has to come off aswell, hope yours is easier
cheers
Joe