Dell D275EM-00 - 275W Power Supply for Optiplex 3010 7010 9010 MT. Dell. Item#: D275EM-00  Category: Power Supply Max Power: 275W Dimensions: 150mm x 86mm x 140mm
Hello, I have another question about the Dell Optiplex 7010 MT. I couldn't find dimensions for its power supply, as I'm looking to upgrade it and the mounting system requires a certain length of PSU (there's a tab that has latches to grab onto the end of the unit). I saw somewhere that it accepts standard ATX size power supplies, but I'm quite new to pc building and it never hurts to double check, right? I plan on using the Corsair CX Series CX550M Semi-Modular version by the way. Cheers! 
Power Supply Dimensions