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. Provided is a list below of known fitments.Also supplied 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 have been 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*We are supplied in pairs either 2 x Front, 2 x Rear or Mixed (1 x Front & 1 x Rear) please see listingsKnown fittings. Will fit many others but I only have these cars available to check:Audi R8 RearNissan GT-R RearBMW M4 RearAston Martin Vantage V12 RearMercedes C-Coupe RearChevrolet Corvette C7R RearBMW M4 RearMercedes SLS AMG RearAudi A5 RearFord GT Le Mans Rear* Original wires will need to be cut, these would need to be re attached if ever the original guide was re-fitted