I've recently bought an iPhone cradle for my 57 plate A3, part number: 8TO.051.435.F and it doesn't fit! I've been watching loads on eBay and all of them say they will fit either arm test or dash board phone prep mounts but I'm certain that this does not fit! This particular one has an ariel port on the back and connection points in the shape of a cross but this doesn't correspond to my phone prep in the car. does anyone know what type of cradle I need and provide a part number please? Thanks in advance, Andy.