Selling here is USED  1951-1959 Chevy 1/2 Ton 3100 Series Front Spindle or Steering Knuckle 
This was pulled out of 1958 Chevy 1/2 ton Truck many years ago and stored in my shop shelf.
I believe the Correct GM Part number for is 3709756
LEFT and RIGHT sides are the same

The spindle Treads are good, I did hand spin a nut 
The Hub bearing surfaces are good
The King Pin Bushings will need to be Installed. King Pin Bushing Bore is good as Shown in Pictures
 
Looked up my records it appears to me
GM Parts Numbers
for 1951-1954 is 3696337 ???   But Please do your own research, I am going by what i have written down in my records
for 1955-1959 is 3709756 ???   But please do your own research, I am going by what I have written down in my records

THIS WAS PULLED OUT OF 1958 Chevy 1/2 TON 3100 Series

Please look over all Pictures and use the ZOOM Option

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KEYWORDS
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1957 Chevy Chevrolet Truck 1/2 ton 3100, 1958 Chevy Chevrolet Truck 1/2 ton 3100, 1959 Chevy Chevrolet Truck 1/2 Ton 3100