you can use stock spindles from a 71-87... with the ball joints for that year truck
and yes you could get disk brake drop spindles than the disk brake stuff for a 72
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68 4x4 short fleetside deluxe cab 327 air
56 big window short stepside 235 dual 1 brls
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70 C10 LWB fleetside custom/10 350/TH350