Xserve PCI-X -> PCI-E Fibre Channel Card Riser

Hi All

I have a spare Apple Dual Channel 2GB Fibre Channel PCI-X Card (formerly from a PowerPC Xserve) and an Intel Xserve that would normally take an Apple Dual 4GB Fibre Channel PCI Express (or PCI-E) Card that I would like to install it into. I understand that I can use a riser to adapt the PCI Express slot to accept the PCI-X Card.
Can someone please advise whether this is actually doable and if so the specs/part number for the riser and where I can find one?

The fibre card specs are:
Manufacturer Part# M9274G/C [by LSI Logic]

The Xserve specs are (Apologies if this is TMI):
Identifier: Xserve1,1
Processor: Dual-Core Intel Xeon
Proc Speed: 2GHz
No of Processors: 2
Total No of Cores: 4
L2 Cache (per processor): 4MB
Bus Speed: 1.33 GHz

Thanks in advance.