The bezel might be a little more difficult, as more often than not, they glue them together. It might take some heat, and a couple strap wrenches to get the two halves of the head apart. Sometimes it unscrews fairly easily, but other times not. There are several threads here on the forum relating stories of guys really scratching/gouging up their lights trying to take one apart that's been "glued" from the factory. If you do manage to break it loose, the threading would be "conventional". Lefty loosey, righty tighty. Good luck.