One thing to watch mate, if you put wheels less than ET 40 on your 4x4 you will need to fit spacer plates to clear the calipers, i have recently fitted a set of 17 inch RS 7 Spokes to my 4x4 saf cossie, they are ET 38 and i had to fit 3mm spacer plates to stop the cailpers rubbing the inside of the wheel . Original ford lattice alloys are 40 mm offset so that says it all really , better to stay as close to factory offset as is possible