HID bulb size question

[Dragonboas]

I just bought an s14 and had one of the headlights go out, upon removal I realized this has HID's so I don't know what size to get. I took it to a shop that sells kits and the owner said I had what appeared to be factory ballasts but if they are I don't know what they came off of, as far as I can tell no s14 came with factory HID's. < correct me if I'm wrong. Looking at pictures it looks like an H1 bulb but do I need to know anything else before ordering a bulb like a connector size or anything? I've never messed with HID's that weren't factory so this is all new to me and a bit confusing. Whenever I look online I get page after page of how the different power creates a different color which doesn't help me at all. Any help would be greatly appreciated, I would like to drive the car after 5pm.