Vehicle-Specific Fit: Designed to fit 1955–1957 applications using dropped spindles for proper caliper positioning, Precision Machined Steel: Manufactured from high-quality steel for strength, accuracy, and long service life, Heavy-Duty Thickness: .38" thick bracket material provides solid mounting support under demanding driving conditions, Thread & Mount Specs: Features 7/16"-20 threaded holes with a 5.50" centerline spacing for consistent installation, Pair with Protective Finish: Sold as a matched pair with a zinc finish that helps protect the surface and maintain durability.