Alright this almost wasnt worth it. One guy said he used an exacto knife and i thought thats be fast...the plastic is harder than i thought...
switched to files... i dont know if the op is a file master or im a file noob but it took more than 10min a light to file it down and i couldnt even get the last little nub off at the bottom.
luckily you can leave like a 2mm stump at the bottom and still click the fastner over the back when you install the lights.
the lights also take a little finese to get the metal fins into the housing. it doesnt just fall in like the h11 does.
BUT i can confirm that it works and is noticably whiter and brighter.