The 5mm lifting hinge clamp of which there is one in each runaround door. This has now changed shape but still fits the Mark 4 doors. The key slot shape has altered.
From 15th January 2019 the door changed to Mark 5 so the clamp also changed. Please choose Mk 5 upgrade to receive the spacers and new fixings, and sliding cover with the clamp.
The thick clamp is not used in the Mk 5 door.