Vauxhall (Opel) Signum rear suspension arms

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Super Moderator
Anyone ever had the misfortune of changing the banana shaped rear arms on a Signum?

The arms on the old bus have developed far too much play in them recently, so I'm intending to swap them out over the weekend. I've not really had a good look, sticking my head under the rear bumper is about as much interest as I've managed to muster so far, but the access to the inner bolts appears to be a little tight. I was wondering if there are any tips or tricks that may be useful to know before I even think about waving a spanner at the thing?
 
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