Heh, the length is perfect. The width is perfect. Unfortunately, the corners are too "sharp" and hang up in
the holder. The same rectangle with corners tooled back to a larger radius ought to do it -- at some future time.
Fired size: 5.9 inches (15.0 cm)x 8.7 inches (22.1 cm) x 1.3 inches (3.3 cm)high.