For Dell OptiPlex 3020 9020 SFF 255W Power Supply NT1XP L255AS-00 PS-3261-2DF - Parts-Dell.cc
R7PPW - 255W For Dell Optiplex 3020 / 9020 SFF Small Form Factor Power Supply - 365PowerSupply.com - Replacement Laptop Power Adapters,Desktop Power Supply & Server Workstation PSU.