Place a Want Ad in the Swap Meet. Be sure to indicate that you want spindles (steering knuckles) that will hold the bushings tightly.
Do you mean that your spindles were
galled, or were they "wallowed out" where the bushing sits/seats n the spindle? This is a common problem. That is why you want spindles that will hold bushings tightly. The bushings should "float" up and down in the spindle, but the bushings should not move/wobble side-to-side in the spindle.
The same size/style 3100 spindle was used from 51-59 (both sides are the same part), but they are hard to find.
By the way, if the bushings and spindles are well-worn, the king pin hole in the axle will most likely be over-sized and the standard king pin will be loose. You might need an over-sized king-pin and bushings set.