I'm about to order a bezel, trackball, red number key pad, and unbranded case bottom cover from Dealsishop.com, but I wasnt sure if I needed to buy a new battery latch for the new bezel. My guess is no, but I want to make sure before I place my order.
Grab it from berrymods.com. The flat black bezel they sell is by far the highest quality bezel there is and it comes with all the buttons and hatches already on the bezel itself so you dont have to spend 3 hours fiddling with the buttons to make sure they're on properly.
Some bezels (pay attention to the details when you order, it always depends) come with all the buttons for you, including battery latch, bottom piece, etc.