What are the dimensions of a CMK-3 Keyboard stack?

Single: (w x d x h): 35 1/2" (90.2 cm) x 10" (25.4 cm) x 2.8" (7.1 cm)

2-Stack: (w x d x h): 35 1/2" (90.2 cm) x 18" (45 cm) x 7" (17.8 cm)

3-Stack: (w x d x h): 35 1/2" (90.2 cm) x 22" (55.9 cm) x 8 1/2" (21.6 cm)

4-Stack (w x d x h): 35 1/2" (90.2 cm) x 25" (63.5 cm) x 11" (27.94 cm)

The width dimension includes 1" block on either side for attaching the keyboard to brackets or key cheeks. So, drop 2" off the width to get the width of keys only.