Your search for "UCSC-RAIL-2U" revealed the following:
Cisco UCSC-RAIL-2U UCS C240/C260 Series Friction Server Rail Kit
SKU: NSH-5810
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 79.99
• Only 2 remaining
Call if you need more
Cisco UCSC-RAILB-M4 UCS C220 Series Server Ball Bearing Rail Kit
SKU: NSB-0998
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 89.99
• Only 1 remaining
Call if you need more
NEW Cisco UCSC-RAIL-2U UCS C240/C260 Series Friction Server Rail Kit
SKU: NSN-7018
Condition: New
Shipping: Overnight Options
Warranty: 365 days