The offset could be anywhere from 35-45mm so until he knows what alloys they are we had better not scare him too muchchrisunoman said:You will need some new spigot rings too, fit in the back of the alloy to centre it on the hub.
I think the offset of those alloys will be 45mm, so you will need some 5mm spacers. Otherwise they may catch on something, and look to far into the arch.