ah we're getting the spec now ........ I can tell you but you'll have to wait till I'm sober which may be tomorrow ............ for now ET is the same as offset
and seeing as you're increasing the wheel width, you may wish to consider wider tyres (with lower profile)
or as an alternative .............. buy wheels and tyres as below in my sig which will give you all you're asking for without the hassle of will it/won't it ?