Your search for "c9500-acc-kit" revealed the following:
NetworkTigers C9500-ACC-KIT-19I-NT Rack Mount Kit for Catalyst 9500 Series
SKU: NSN-7142
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 79.99
• 50 in stock
Call if you need more
NEW Cisco C9500-ACCKITH-19I Catalyst 9500 19 Inch Rack Mount Accessory Kit
SKU: NSN-0984
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 249.99
• Only 2 remaining
Call if you need more
Cisco C9500-ACC-KIT-19I Rack Mount Kit 700-111221-01 Catalyst 9500 Series
SKU: NSB-0986
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days