I also got 27-1/2' for the rear, stock size Toyo Proxes, on my SRT. Just remember you're gonna get a slight difference in height between different tire makes of the same size.

Copied from the brochure:
Wheelbase 94.5 in.
Track, Front 58.8 in.
Track, Rear 59.1 in.
Overall Length 159.8 in.
Overall Width 69.5 in.
Overall Height Coupe: 51.5 in.
Roadster: 51.8 in.

Ground Clearance 4.9 in.