The PXI-1033 has integrated MXI express and is usually sold with the PCIeMXI express controller card in a package. If you would like to purchase just the PCIe card (don’t forget about a cable!) you can navigate to the section on MXI express (PCI Express control of PXI) and you can find options to purchase a (PCIe-PXI package or just the PXI or PCIe cards individually). The link is HERE, and you will need the PCIe-8361 or PCIe-8362, plus cable.
I don't think that part is available online as an individual card, however its part number is 779504-01, you can call us with that number and we should be able to set you up. (FYI the MXI controller for the 1033 uses the same card as the PCIe 8361)
1 (866) 337-8760
ps what ill fate has your original host card fallen too? or did you just want 2?