back of the bulb, pretty simple to remove...
notice the bulb on the right has a light reflector on the back of the bulb, notice the width. i had the trim the bulb reflector on the left to allow it to fit into the headlight housing.
the next steps are to make sure everything is tied up out of the way and connected, then start hanging parts back on the bike, then test the new lights
hope this helps for people thinking about upgrading their bikes lighting, if anyone has any questions about any of this ill be glad to help.