Your search for "ec8404006-e6" revealed the following:
NEW Extreme EC8404006-E6 8418XTQ 16x 10GE 2x 40G QSFP+ Switch Module
SKU: NSN-5182
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme EC8404006-E6 8418XTQ 16x 10GB Copper 2x 40GB QSFP+ Switch Module
SKU: NSH-9242
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days