I have an Athearn F7A that I need part for. The windows I think a re item #11016 from Athearn. I also need the coupler system as the unithas no coupler assembly at all so I don't recognize the way this locomotive should look to even know what to search for. Rolling stock couplers are rather straight forward looking and so is the coupling system on my Athearn SW-1 switcher, but the F7A looks foreign to me... any clues as to what I need? Thanks!!