Just to clarify........a MK3/Mk4 cab should have a BLACK 55mm quadrant fitted, a white one is smaller, 53mm IIRC.

A smaller quadrant will make the pedal lighter but need a greater throw to fully disengage the clutch, hence why smaller quadrants are fitted to lesser models which have smaller engines & clutches.

Have you considered doing a MK6 pedal conversion at all?