9U (3x 3U), 10U VCS3 style (3x 3U, 1x 1U), 12U (4x 3U), 14U (4x 3U, 2x 1U), 15U (5x 3U), 18U (6x 3U), 19U (6x 3U, 1x 1U), 21U (7x 3U)