I think that the axle is oriented so the wedge bolt that holds the king pins in goes in from the front. At least that's the way my '51 was. I can go check to be sure.
The hole that's centered on the axle is for the spring center bolt, and the one that you're pointing to is for the caster shim, which would to in with the thinner part to the front.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.