Only thing now is I'm confused with offsets etc,the calibre ones do not match the existing BMW spec,can get the fronts close with a stickout of 13mm in 18"x8.5,but the rears are nowhere near in the wider staggered setup witha stickout of 9mm and an internal stickout of 29mm in 18"x9.5 which may be too much inside the arch. Using the 18"x8.5 on rear takes this to a stickout of 1.3mm and internal stickout of 11.4mm. These figures were obtained using online wheel and tyre calulator which I assume to be accurate. Never done this wheel change before and hopefully looking for some experienced advice on the matter or do I look for a different wheel which would be a shame as these have really caught my imagination. Thanks.