This question is more general, but how can you figure out replacement bulb sizes if a used car comes with and HID conversion kit? I'm actually trying to replace a low-beam bulb in my Mazda 3 hatchback and found out that the previous owner put an HID conversion kit in there.
I've done a bunch of research, but I'm not sure how to match the replacement bulb(s) with the kit I have, because there aren't any real distinguishing markings on the bulb or ballast assembly.
From what I can tell (with extremely un-educated background), all I need to do is get a standard HID replacement bulb that fits a "H7" bulb. Most seem to be fairly standard and mine would be either a 6k or 8k color and probably a 35W rating. Is that right, or do I have to find the exact manufacturer to really plug and play the replacement?
Any help would be much appreciated! I'm lost, confused, scared, and getting the car ready to sell (now that I bought my Tacoma!).