I've a 2008 Grand Modus which hasn't got rear door speakers fitted but has the wiring already installed. My local Renault garage will supply and fit speakers but at a cost of around £300+! I went to Halfords in Salisbury who said cost would be £70 but when they examined the door they said they could not fit them without cutting the door framing about. I am no good at DIY - is there an alternative to being ripped off by Renault yet again or will I just have to pay up?