Did you try contacting them to see if they could customize a fixture? (I have no idea if they do this or not... but seems like they SHOULD from the name of their company? lol)
I really think I should just give them a call at this point, rather than email to see if they can give me any options. I really like to go with BML.It's only under 1 1/2 diff.. (3/4 per side).. I'm surprised you can't get this done.