Your search for "finisar ftlx8571" revealed the following:

Finisar FTLX8573D3BTL-TM 10GB BASE-SR 850nm MMF SFP+ Transceiver

SKU: NSB-9914
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Finisar FTLX8574D3BCL-HD BASE-SR 10 Gigabit 850nm Short Range MMF Transceiver SF

SKU: NSB-8752
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Finisar FTLX8512D3BCL 10GB BASE-SR 850nm MMF XFP Transceiver

SKU: NSN-7218
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Finisar FTLF8528P3BCV-QL 8GB 850nm Multimode Datacom FC SFP+ Transceiver

SKU: NSN-7799
Condition: New
Shipping: Overnight Options
Warranty: 365 days