Chris, by all means, email them... I did. What is a B13 rotor? Oh, you mean a rotor that is 250mm x 18mm, with the 4x100 lug pattern? Sure, we've got a rotor that matches that application. Watch out for Jeff when you email them. They respond very quickly, but man does he push the "let us also sell you a set of metallic brake pads". Maybe you'll get a more concise and clear answer than I did. Later, Mark