The flywheel from TurboSport cost Ł275, new flywheel bolt price I can’t remember, a few quid each I think. I bought the clutch, slave cylinder and spring plate from Euro Car Parts for Ł216 with my discount code I sometimes get. Worth noting the following if you want to do this... make sure the clutch plate you buy is sprung loaded to take the strain off the crank shaft on hard pull always off the line. Also, if you replace the cylinder make sure you use the o ring on the old one or buy a new as the kit I bought never had a new one and didn’t think about it until I’d fitted everything and filled the gearbox with oil which then leaked through the space!! Finally, TurboSport where by far the best priced for a solid lightweight fly but remember that the ST170 had 2 different clutch sizes throughout the year range so check which yours is, 220mm or 240mm and tell TurboSport as they do the fly to suit. Apart from that, no other issues. No vibration. Better revving, nicer through the range and better fuel economy.