Button-front/rear door sill lock - FQK101070 - Genuine MG Rover
From some reason known only to Rover they issued different VIN change points for this part depending on which model 800 the car was.
For 820i and 825D it was used from VIN AM191278.
For 820Si and 827Si it was used from VIN AM190635.
For Vitesse it was used from VIN AM190793.