Your search for "kit-4post-nt" revealed the following:
Arista KIT-4POST-NT 4 Poster Rack Mount Kit for 7050SX, 7050TX, 7050QX, 7280R
SKU: NSB-0784
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 197.99
• 47 in stock
Call if you need more
NEW Arista KIT-4POST-NT 4 Poster Rack Kit for 7050SX, 7050TX, 7050QX, 7280R
SKU: NSN-8311
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 212.99
• 49 in stock
Call if you need more
Arista KIT-2POST-1U-NT 1RU 2 Post Rail Kit for 7280R, 7050SX, 7050TX, 7050QX
SKU: NSB-8731
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 62.99
• 11 in stock
Call if you need more