Well they ARE the jacking points - but not in the way that nearly everyone uses them. Citroen actually had a special tool to insert in those square holes - Tool 2505T.
They are large, paddle-shaped pads made of cast iron. Use of these extensions provides a larger surface area for jacking.
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| Tool 2505T |
One of the problems with trying to use the 2505s is that the square tubes holes on the DS tend to get filled with mud and water (also causing the box sections to rot out by the way). It means that the 2505Ts were hard to fit, or were not ffully fitted - which can be dangerous. Garages clearly had to apply force to get them in. I've got a couple and you can see where the end are flattened from hammering!
More often than not I used the 2505 'paddles' as intended: for jacking and then put an axle stand under the square section, but also admit to jacking against a block of wood placed at the corner behind the wheel arch. It's just easier than the struggle that it takes to get these 2505s out of a rusty square section!
