Your search for "hpe sfp28" revealed the following:

NEW NetworkTigers 5069-6535 Mounting Rack Ears for HP J9028A, J3295A, J9138A

SKU: NSN-1686
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Aruba JL448A X2C2 RJ45 to DB9 Console Cable

SKU: NSB-5559
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW NetworkTigers 5069-6535 Mounting Rack Ears for HP J9089A, J9279A, J9087A

SKU: NSH-7623
Condition: New
Shipping: Overnight Options
Warranty: 365 days