Your search for "n6k-c6001-acc-kit" revealed the following:

NEW Cisco N6K-C6001-ACC-KIT Nexus 6000 Series Switch Accessory Kit Rails

SKU: NSN-4652
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco N6K-C6001-ACC-KIT Nexus 6000 Series Switch Accessory Kit Rails

SKU: NSH-8455
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days