I've had a quick look on here:
http://mazdaepc.com/and I can't find any front fog lights listed for the 323 BA Sedan (Mazda 323 - Mazda 323 1995-08 BA). As far as I can see the later model has the same or very similar front bumper as the 323C (?). If so, the drawings of the front bumper (Body Exterior Trim - Front Bumper) for the 323F BA and 323 BA without fog lights appear to show that the blanking covers have different mounts but not much more. Not conclusive I'm afraid.
as far as I know the front fog lights from early Demio's are supposed to be the same. The fog lights from the Bongo may also be worth a look, but I'm sure the Bongo bracket is different again.
Jon