In answer to your original question getting a new fire brick for this fireplace will be very difficult. Do you still have the bits? If so you could use Fire Cement to glue it back together looks like this has been done before. Fire cement comes in a pot and is like a putting which goes hard when heat applied.
Good story
way too many pieces to glue back together. The fireplace is never used, so if replacing it is going to be difficult then I can cut some ply or MDF to fit the gap.
In answer to your original question getting a new fire brick for this fireplace will be very difficult. Do you still have the bits? If so you could use Fire Cement to glue it back together looks like this has been done before. Fire cement comes in a pot and is like a putting which goes hard when heat applied.
Good story