These adapters allow removal of the bulky Carrera guide system and the fitting of a standard guide flag, they are designed to suit Slot-it guides with a screw fitting. They are available in front and rear screw versions. I have provided a list below of known fitments. They are supplied as a pair (1 x Front & 1 x Rear)I also supply 8 x spacer washers to allow fine tuning of the guide height depending on guide flag and brushes used, this is also down to user preference.They are designed to be fitted without any modification to the chassis, no gluing or cutting needed, simply re uses the original screws. It does not damage the original set up.Please note these are intended for decoration purposes only, they are not a toy and should not be used by children under 12 years. They could be a choking hazard if swallowed