1966/'69 A100 Twins Build

Mine has three holes along the top for the wiring straps that fold around the wiring loom.

Also have an extra hole or two that are random.

The holes you have on the bottom left (looking at it in this picture) will be for the starter solenoid and probably also to hold wiring - including that to the starter.

That hole you have in the middle looks off....like someone did that afterwards.

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Where is your ballast resistor mounted?