After all the measuring, cutting, sanding, foam-filling, sanding, masking, painting, leaking and test fitting, I finally got all four (six, actually) flares installed. The end result is a lot more room for the tires at the cost of some structural integrity of the unibody, the risk of water and dirt inside the fenders and quarter panels, and a potentially leaky wiper fluid reservoir. That's the price you pay for running bigger tires, I guess! I also don't like how the tires are hidden inside the flares a bit now. Wheels with less backspacing would be good, but I think I'll fix it with some wheel spacers down the road.