For Dell Optiplex 990 Mini-Tower Drive Caddy Mount Bracket 1B31D2600-600 C-3598
OptiPlex x90 Series - 390, 790, 990 MT + SFF. OptiPlex x010 Series - 3010, 7010, 9010 MT + SFF. OptiPlex x020 Series - 3020, 7020, 9020 MT + SFF. Compatible for the following models Part numbers may vary, however, will be one of the following.