I've seen parts diagrams that detailed, but unfortunately only for motorcycles (Honda for example).
The Ford computer parts diagrams I've seen are VERY poor in that regard, for example i had to find a part number in this forum for my wiper relay since the dealer's parts diagram simply listed all the relays in that area by part number without describing the function or location of ANY of them!
The parts person mentioned that the only way he can tell which one is needed is for a mechanic to pull the old one to match numbers!
When facing an issue like yours, my usual approach is to loose fit all the bolts looking for similar amount of shank exposed when they are only screwed in one turn. Which goes where usually becomes obvious.
Did the ones installed so far seem to tighten up properly?
Sometimes when a bolt has to go through a couple parts you can get a false sense of the proper length when it screws into an unthreaded intermediate piece instead of the threaded hole in a part further in.
Using a small rod to check hole depth can determine if this is happening to you.
I'm betting this is what's happening, and the long bolt belongs in one of the holes a shorter one is in now....