Power Supply Upgrade options for Optiplex 990 Mini Tower?

Will any ATX Power Supply fit in the 990 MiniTower?

The system comes with 265 watts but I'd like to install a more powerful supply so I can upgrade the video card to whatever I want.

On NewEgg, the sizes of the various power supplies seem to be slightly different dimensions than the Dell Optiplex 990 supply. 

Plus, Dell doesn't leave any margin for error in replacing with the exact same dimensions as the original equipment. They have all this aluminum and such preventing even a few millimeters difference in size with the replacement.

I prefer a Corsair Gold 80 Plus.

Thanks.