(approx based on a 1988 Sierra 2.0 GLX) As you might expect, parts are plentiful and relatively inexpensive. A clutch assembly will be around £85 and an alternator should be close to £65.Brake pads are around £15 a set, a replacement headlamp is close to £60 and a door mirror should be in the region of £40. A full exhaust system is about £75 and a starter motor around £100. A front wing is around £60, a windscreen about £75, a tail lamp about £45 and a catalyst about £295 (with a £10 surcharge for the old unit). Front dampers are around £30 each and rears around £15 each.