On my much later Roadster the door locks have keys in the (now very old) FS series as used on series Land Rovers to name but one. You can buy keys if you know the number or maybe a new lock barrel with matching key.

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Given there are five pin positions on a barrel and five positions for the rectangular hole within each pin you have 125 combinations.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone