These are ready to print slot car files for a Hillman Imp.I have uploaded two different chassis depending on the type of wheels. One chassis suits 10mm wide wheels and the other suits the 'Pendle Slot Racing' PCS-WTP13 aluminim windows. The minilite wheel inserts are 10mm and fit PCS-WTP13 as photographed.The chassis is designed for a slimline motor shown in the photograph. The chassis is designed to have brass sleevesaround the axles as bearings and are adjustable using a 3mm grub screw.