Pre-1987 110s had different size key barrels for the ignition, doors and (where fitted) rear door. The bonnet lock (where fitted) is the same size barrel as the rear door, and on mine they are keyed the same.
Common keying them seems to be only feasible by replacing the locks (and hence doors) with those from 1987 on.
I simply fitted central locking for all five doors and I don't lock the bonnet as a general rule.



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