Qty. 8 NOS matching set of original 14mm copper* spark plug gaskets as shown in the First 2 Photos above. AC Spark Plug used this 3 tab, 'Spin-On' design beginning in May, 1959 and started being phased out in Feb. 1966, it changed to a Zinc finish, but still retained the large 0.780" outer diameter. 14mm AC Spark Plugs were used on all General Motors Divisions engines.

*AC gaskets were Copper plated beginning in 1946 after WW2. Prior to 1940, AC gaskets are mostly a solid Copper composition, but had a hollow core. Part Number 1555475 goes back to 1933 for GM, and is still used on the smaller OD 4-tab ACDELCO today. 

NOTE: these will Not fit 14mm spark plugs with the Suffix containing Letter 'N' or 'XL'

Aircraft gaskets will have a solid core, and are flat on both sides.