help finding new Alco shells

I can't say how close it would be, but I think that Detail Associates makes a version of the GE Floating Bolster sideframes. As I recall, it's the same general shape, although you might have to add to or alter the details.

Wayne
 
The FB-2 is completely different. No US-built Alco had them, only MLW M420s.

As I said, I'm no HO expert, but AAR trucks have to be easy to find. They were so common in reality...
 
You should be able to find some old Model Power FAs or Sharks, or some LifeLike (Proto-no-thousand :rolleyes:) RS-11s that will have suitable AAR trucks.
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Wayne