^this. A 275/40-19 is no issue on a 19x9.5 rim. It won't matter the car or year, as long as it will take those rims.
I use the RTR 19x9.5 charcoal rims with 275/40-19 tires on my 13, the 15 shouldn't be an issue.
2013 GT Premium, Red Candy Metallic, Recaro seats, Electronic package, Strut tower brace, Sway bars, SHR flush mounted window louvers, RTR street-spec axleback exhaust, Ford Racing Boss 302 Side Exhaust, RTR wheels, 50/35% Window tint, Steeda black shorty antenna, and Ford OE Matte Hood Vents.