-What roof box do I need to fit my car? -I have lost my key, can I get a spare? -I have wider bars, will your roof boxes still fit? What roof box do I need to fit my car? The type of roof box is dependant of the size of the load carried, and the size of the vehicle the box is fitted to. All Mont Blanc roof Boxes will fit any vehicle with roof bars spaced between 60cm – 80cm, however the larger boxes in the range can look cumbersome on very small vehicles. I have lost my key, can I get a spare? All Mont Blanc roof boxes have a lock identification number on the barrel of the lock and on the keys. If the keys are lost a replacement set may be purchased by calling our customer helpline quoting the barrel number. I have wider bars, will your roof boxes still fit? For oversize bars a universal wide bar kit (Part No. TBKIT) may be purchased. For oversized aluminium bars with a C – slot profile in the top and aluminium bar fitting kit (Part No TBOLT) is available.