I don't know which fork they are for but don't be tempted to fit them to your M20 (unless perhaps you fit four?). If the damper discs are too thin, either initially or through wear, when the friction wheel is tightened it puts an excessive bending load on the cranked damper plate which frequently causes it to fracture...Ian
you will have to call in the council asbestos squad they will tap off your house and have a couple of chap in nuke suits putting them in a bomb proof container