This kit is used for 1956-1967 Corvette hardtops. The threaded receiver, rubber washer, and nut fasten to the body of the vehicle; the chrome bolt fastens the hardtop (through the hold down brackets) into the threaded receiver. This is a four piece kit.
1956-1960 Corvette hardtops require 3 sets, 1961-62 hardtops require 4 sets, and 1963-67 hardtops require 2 sets.