Shopping online and prompt shipping worked out perfectly.  I had the Allston 3-light Vanity Light installed and operable within 1.5 hours.  The size/the back mounting bar was long enough (somewhat shorter than the front design) and wide enough to cover the large whole the builder made when installing the initial fixture.   I did my own installation--it was easy while taking the necessary electrical precautions!  The light fixture fit perfectly!  For the small bathroom space, the illumination is very bright when the three highest/safest lumens/wattage are aglow.