The genuine (grey) radio-mount is available brand-new for just a few £ (don't pay more than £5 for a S/H one) and makes fitting a breeze, as for wiring you will be needing a perm +VE, switched +VE,-VE and of course speaker & aerial cables. All of these will fit neatly behind the rear of the grey plastic dash however I do suggest using a fly-lead for the aerial lead as that way you don't have to get to the rear of the dash if you have to replace the aerial (they quite often get snapped), just plug into the additional connecter under the bonnet.