Adding an IEEE1394 (FireWire) to an R410?

I'm new to rack hardware, and I've just bought a second-hand Dell R410 to which I'm thinking of adding an IEEE1394 (FireWire) interface.

If I've understood correctly, from reading the R410 system hardware owner's manual, adding a PCI card requires use of an expansion card riser, placed in the expansion-card riser socket.

This expansion card riser has two slots: one is reserved for a specific Dell integrated storage controller, the other is available for a x16 link Gen1 or Gen2 PCIe expansion card.

Is this correct, and can anybody make a suggestion for a suitable IEEE1394 card?

Regards,

Keith