VcHostFibreChannelHba.device doesn't reflect what is seen in vCenter

I'm writing some workflows to take care of automatic zoning using the Cisco MDS REST API.  As part of that I need to be able to identify ESXi host HBAs on the SAN fabric.  Today, we create device aliases based on the name of the HBA in vCenter.  For example, if I have a host called tstdev-hb2-0004 and it shows HBAs vmhba0, vmhba1, vmhba2, vmhba3, my aliases would be:

tstdev-hb2-0004-vmhba0

tstdev-hb2-0004-vmhba1

tstdev-hb2-0004-vmhba2

tstdev-hb2-0004-vmhba3

When I run this code:

for each (var hba in u_host.configManager.storageSystem.storageDeviceInfo.hostBusAdapter)

{ 

  if (hba instanceof VcHostFibreChannelHba)

  {

  System.log(hba.device);

  }

}

I expect:

vmhba0

vmhba1

vmhba2

vmhba3

(which is what is displayed in vCenter)

But what I get back is:

vmhba1

vmhba2

vmhba3

vmhba4

How can I get the display names as displayed in vCenter?