That is precisely why they are so rare.

Always, always, always, set a big ol' blanket or comforter or pillow underneath your work area before attempting to remove a glass lens. I have broken at least a couple of them myself and yes I know exactly how you feel right now. Your knee is dislocated from kicking yourself.
Save the reflector part, you might need it. I have to go out to my shed in a little while to check on my pregnant kitty, so I will check my inventory of glass lenses. I seem to recall that I have one that doesn't have the reflector in it. *fingers crossed*