Pikey as fcuk, thats why. If a jobs worth doing and all that.Why drill and bolt it? You can just use double sided tape to attach it to the bracket, that's how most are done.
Is that all you need to fit this? i.e. Renault told me today there are 2 bits to fit in an alpine changer? I've only ordered the base plate (£8), do I need the mounts for the changer as the changer I've got came on a ph1 bracket.