OP, try putting 5mm spacers front and rear and see what happens. If your tires don't rub, remove the 5mm and use 10mm. Basically, keep trying on wider spacers until you rub, then back off a little
. Seriously, you can go wider than your setup if "flush" is what you're after. Remember, when your suspension compresses, the top part of your wheels move inward (towards the wheel wells) so your wheels and tires can literally poke out a little while the car is parked and you still won't rub when driving. In fact, when I ran the OEM Sport wheels, Swift springs, and 20mm front/25mm rear spacers, the rears stuck out about 5mm but the tires never hit the fender even during spirited driving.