Bought 2 types of LEDs both for h7 replacement. Both did not fit as there is this big heat sink at the back. Still looking it has go be as small as the oem h7

 

the hi beam halogen can be replaced with a hid kit, the bulb base matches the H4? H7? what ever kind it is, and it adds a ballast to power it. You have to wire everything in and do the job. What ever comes with a kit. And almost all hids now come with a capacitor to make it instant on. I have some in my mercedes and its completely normal. And you would get 5000k or 6000k color
Look on ebay for kits