http://img293.imageshack.us/img293/4936/wheeloffsetfh5.jpg
Altezza owners who interested into my rims, please check the offset you can fit into, i found it randomly on net, hope it helps :)
so if follow the calculation above, max 17x9 is +49, if 17x9.5 is supposed to be +55, but mine is +41, so it might be 14mm out of your mudguard, about 1cm like that, if you open camber plus a bit touch up your mudguard, this rims can fit in perfectly, anyway Work Vxss is tip top condition and cheap price, grab it before someone took it :)
cheers for chinese new year :)