Replacing PowerEdge 1500SC power supply

The power supply (part #5G022) does not work anymore for my PowerEdge 1500SC. I cannot find a single company that has a replacement part. I figure my best option is to upgrade to a redundant power supply configuration. To my knowledge, this would require parts: 4G856, 0M495, and 2F776. Where can I get these parts? I tried impactcomputers.com, but they don't have all 3 items in stock.
Can someone help me?
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