I have not really looked over it yet but there is a 1200 page Sears catalog from 1912 here.
https://archive.org/details/catalogno12400sear
I have been looking for the 1896 one (the first) as that feels closer to what you might see from post war tech, but it might be interesting.
Edit.
I took a look at it and parts would probably be useful for what might be available in KFS.
Since it is a pretty big download 220MB i thought a few example pages might help one decide if a download is worth it.