I could have sworn there was a comment about this subject in one of the BM topics, but for the life of me, I can't find the post or the person who posted it. There was a comment that the underwing external tanks on Phantoms had a flange/stiffening rib on the LH side of each tank, not both sides as molded on the new Airfix kit. Got me to thinking and looking at photos- darned if there were tons of photos that showed them on the LH side of the tanks, but none I could find that showed them on the RH side. I then went to the "oracle's" website (That's Tailspin Turtle, aka Tommy Thomason) and found the information that can be found in the link I have posted below. Thought this might be useful for all you Phantom phanatics! Thanks to the original poster for your comments, and thanks Tommy, as always, for your knowledge and blogs on USN aviation!
Mike
http://tailspintopics.blogspot.com/2013/06/things-under-wings-f4h-f-4-phantom.html