As for fitting, it is quite a long job depending on how knackered the internal of the beam tube is and also the state of the pins which the bearings ride on. At a guess, you will probably need new pins as well, which bumps the price up somewhat.
3 degrees of rear camber is a little too much, so the bearings are probably on their way out.
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"Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6
2000 (X), Moonstone