These bulbs are delicate. They are devils to install, and easy to break if you twist them even slightly during installation. The bulbs have two spindly legs that are inserted between two clamps behind a heatshield with two tiny pinholes in it. Because these bulbs get very hot the clamps become very stiff and it can be extremely difficult to get the new bulb in. The solution to this problem is to give the old bulb a good wiggle about before removing it to loosen the clamps. If the new bulb still doesn't slot in easily insert a short drawing pin and wiggle it up and down. Do not be tempted to twist or wiggle the new bulb as this is how they break. If the clamps are loosened up enough the bulb will go in with very little resistance. This is just one of those times where a little bit of inside knowledge can help save a lot of tears and swearing that would make a sailor blush. Good luck!