Physical Dimensions: Overall .119a (confirmed, depth approximated): 111 3/4 x 21 1/4 x 2 in. (283.8 x 54 x 5.1 cm)
Overall .119b (confirmed, depth approximated): 112 x 20 7/8 x 2 in. (284.5 x 53 x 5.1 cm)
Overall (historic dimensions, superceded): 111 7/8 x 21 in. (284.2 x 53.3 cm)