I don't have any easy way to accurately measure fender-to-fender without risking the tape measure possibly scratching my hood/fenders; however, with help I measured from outside tire shoulder to outside tire shoulder and with my current setup they measure:
No spacers. I was actually surprised at that because to look at it the front-to-rear fenders look pretty square. Currently I'm running APEX ARC-8 wheels with 265/35/18 Toyo R1R tires front/rear.
Front: 18x9.5 ET22
Rear: 18x9.5 ET62
I would have loved to been able to flare out my stock rear quarters to match, but maybe in the future after LSD and a few other things I still want to do to the car. Always need that next mod "carrot" dangling out there in front of me...