Ok, I have come to the conclusion that Dragon have a big tub of 1/350 WWII USN sprues, and they just pick a bunch at random and throw them in a box.
Working through some more sub assemblies, and item “G” (possibly a quad-40mm?), of which there are two required, calls for part numbers M7 and M8. Now, Sprue M only goes up to part number 5, and I have already used all of these parts which are the main gun components (see image below).
So, what choice do I have but to once again go and raid my unstarted Chevalier kit to see what I can purloin. I check the instructions first, and to my great concern, these parts look to be not included and not required for the same quad gun assembly. Instead the 3 quad guns only have a PE ring sight on both sides. Not to be so easily defeated, I decide to scan the Chevalier sprues, knowing now that the instruction manual and the actual kit contents are unlikely to bear any real resemblance to each other.
Lo and behold, what do I find? I find 2 sprues labelled “H” which are completely different from Sprue H in the Chevalier instructions, but parts H56 and H57 are exactly what I am looking for.
Work can now continue, but I’m thinking that if this continues, when the time comes to build the Chevalier, it will either be a bare hull like an oversized rowboat, or I will have enough spare parts from the Frank Knox and Gearing to make it look like the Yamato!