I don't know about the VPI series (with QSFP connectors), but the brackets are interchangeable between versions on the ConnectX EN cards (SFP+ based). The same brackets fit whether the card is ConnectX EN, ConnectX-2 EN or ConnectX-3 EN. Don't limit your search to just ConnectX-3 VPI brackets. If you see one for the older cards and it is cheap enough it would be worth buying/trying.