|Is the power supply for the computer you have listed above?|
If so, that would be an obsolete type of PSU called an AT type. You may be better off finding a used one.
All the information you need should be printed on the PSU you currently have. There have been many changes in the standards since 2001.
Post the model and other information off the PSU label.
Post some details about your computer. If it is an IBM post the model number or service tag number.