Not sure if these are well known on here, but I just got a pair for my Gran Cabrio MC. With a number in the format XXX 1NN, i.e. 5 standard width characters and a 1, the front plate is almost exactly the same size as the mounting plate on the front bumper. On the rear it leaves enough room either side on the bootlid to use double sided sticky tape to attach my magnetic GB sticker. Great product and great service.
