Adding rebar to MSI Z77A-G41: Where to insert ReBarDxe.ffs?

[Tacking1512]

Hi everyone!

I'm trying to add rebar support to this old Z77A-G41 I have. I loaded the BIOS into UEFITOOL, found the GUID of the PCIBus Module:

   

But I'm having trouble figuring out where to place the RebarDxe.ffs file in the given... volume:

   

At least, I'm assuming that the screenshots from the ReBarUEFI wiki on github, is implying that you should insert the ReBarDxe file at the end of the volume, before "Freespace/Section/Volume:

   


Really, I'm trying to find the "end of the volum that the Pci Bus module DXE driver is located in." What should I look for to identify the end of the volume?