Mine is an "A" (I think)

The ventilator ball on mine is shaped like an "A" also (kinda' pointed at the top), but the underside of the ball where the little "flange" is, is much more rigid or well defined looking just like the "B"....almost a combination look of the two balls. The color of the lantern room is closer to a "B" also, so I am really a little unsure. Alignment is definately the "A" though.