RB-RK3 1U rear panel rack kit for large Redbox range, e.g., RB-DA6. Wherever you see this symbol  an RB-RK3 large Redbox rear panel rack kit ears can be used.

Front Panel Kits for Redboxes

A number of customers have asked for non-rackable fronts for the RB-HD1, RB-HD2, RB-ADDA,
RB-UL4, RB-BL4 and RB-LU4. These are available without rack-ears as: RB-FR1, RB-FR2
and RB-FR3.