I am going to install a factory GPS headunit into my 2008 F150 FX4. The unit does not have the GPS antenna so I will need to obtain one. What is the factory part number?

I've seen part numbers 8G1Z-10E893-B and 6F9T-10E893-AA would one of those work or is the part I need another part number?

Thanks in advance.

I also have Sirius so I would need the P/N that would work for both if it is a different P/N. Or do I continue using the current Sirius antenna for sat radio and install the new GPS antenna for the GPS?