Can u identify this spindle and axle?

I have been trying to order some brake and steering stuff for this and kinda hit a snag. These measure to be the chev truck spindle, not the car. The axle boss where the spindle goes is 2.450". Where the spindle bolt goes is 2" thick. Distance between the spindle bolts is hair over 36". The part that's even stranger is the distance between the top center of the king pins is 50". The salesman @ Speedway says no worky.
Any strange old axle gurus out there? I sure would like to use this over and not spend the bucks for another axle.

Thanks,Neal.

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