Your search for "10923" revealed the following:
Extreme 10923 RPS-500p PoE+ 500W Redundant PSU for X440, X440-G2, X450-G2
SKU: NSB-4941
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme 10923 RPS-500p PoE+ 500W Redundant PSU for X440, X440-G2, X450-G2
SKU: NSN-5676
Condition: New
Shipping: Overnight Options
Warranty: 365 days