These dropped spindle arms fit 1935-1948 Ford spindles, original or new. Chassis Engineering forged arms are pre-bent to fit dropped axles. Choice of Standard or Milled leg for disc brake adapter clearance. If your caliper adapter mounts on the inside of the spindle flange, then you need the milled leg option for clearance. Thru bolt design insures safety, eliminating the possiblity of blind threads stripping or pulling loose. These are a deep drop design to clear 1935-1948 Ford and Mercury wishbones.