Is there any chance that your sconces come in a double? You could have a double sconce in the center, then center the mirrors over the sinks. I can't post this pic, but look at the pic in the link below:

edited to add another couple pics I found:

[Mediterranean Bathroom[(https://www.houzz.com/photos/mediterranean-bathroom-ideas-phbr1-bp~t_712~s_2109)

[Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by San Francisco Architects & Designers The Wiseman Group Interior Design, Inc

[Mediterranean Bathroom[(https://www.houzz.com/photos/mediterranean-bathroom-ideas-phbr1-bp~t_712~s_2109) by San Clemente Architects & Designers James Glover Residential & Interior Design

Here is a link that might be useful: look next to armor electric text

This post was edited by olychick on Fri, Dec 27, 13 at 3:07

Good thought Olychick. I'll check but I think they were only single lights.