Your search for "C8300-RM-19-1R" revealed the following:
Cisco C8300-RM-19-1R Catalyst 8300 Series 700-118280-02 19 Inch Rack Mount Kit
SKU: NSC-0328
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco C8300-RM-19-1R Catalyst 8300 700-118280-02 19 Inch Rack Mount Kit
SKU: NSN-0488
Condition: New
Shipping: Overnight Options
Warranty: 365 days