Sorry that you feel someone did not get back to you from Bimmernav. I wonder if it might be possible the response went to your spam email filter or something and you missed it. I am very suprised that someone did not get back to you as bimmernav is very responsive. You might want to try your question again, or make sure your email address is correct if posting your question on the contact us page

http://www.bimmernav.com/store/catalog/contact_us.php