Replacement power supply for a PowerSpec B639 computer — Micro Center

Replacement power supply for a PowerSpec B639 computer

Trying to find the correct replacement power supply for our PowerSpec B639 desktop computer.  The existing power supply measures 5.5 x 5.875 x 3.875 rated at 250 watts.  Unit is marked "250 Watt HEC-250CN-2RU".  Any suggestions?  Space inside the case is limited.  There is about 2 inches clear behind the existing power supply.

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