HP 20-Feb - Manual (Page 30)

28 Installing the 2/20, 4/40 & 6/60 Series Libraries into a Rack Chapter 1
Figure 12 Trim Brackets (4/40 Series)
Note The rack kit includes extra trim brackets. The smaller flush-mount
trim brackets are used with flush-mount racks. The larger trim
brackets are typically used with older HP racks that have a
55mm bezel depth.
(flush-mount trim brackets) (larger trim brackets)