On most models, when replacing a proprietary stereo with an aftermarket standard model, you will need to get a facia plate. Looks like this one would suit your [broken link removed]. Dealers will be able to get these for you too.
The wires will be terminated with a plug (or in some cases two), these may be proprietary also, but you can get adapters which will accept this and plug into the stereo. Halfords stock some of the more common models.
Leo