Benn,
You have to realise that the prices of either the Quaife or Fixit kit (see my website under "transmission" ) are for the gear-kit ONLY and you would have to add £400 to £800 for fitting (depending on whether you had the gearkit as it comes or shot-peened and polished).

You're probably looking at the best part of £4k for either of the above items fitted in the car...