These are reproduction of the steel plates that mount to the A-pillar with the door hinges. It is common for bolts to seize and break off in the original plates or the plates get lost during a restoration. Each steel plate is drilled and tapped for 5/16" x 18 hardware and finished in black paint for corrosion protection. New hardware is available under part # 380575-S2. One kit does one door. Note: 1964 and early 1965 cars use larger 3/8" x 16 bolts. These plates can be drilled and tapped for the 3/8" x 16 bolts if using original bolts is desired on early production cars. These plates can be used on early cars as long as you use the later bolts.