Front offset 18x8.5 ET45

Can you do 18x8.5 ET45 for the front with 225/40/18s I notice that those that have done this run at least a 3mm space so its effectively a ET42. But I just want to run a straight ET45. Basically looking for to do 18.8.5 ET45 front and rear with the 225/40/18 and 255/35/18

Thanks