7000 and 8000 Series Male Std Distributor Cap - Red it has a square bore

it has a square bore carb flange instead of a spread bore

As a result

Kit includes adapter plate to permit use of certain square bore style carburetors

and best longevity on the market

Speedmaster timing tabs are precision-manufactured and bolt on using your existing timing cover bolts

7000 and 8000 Series Male Std Distributor Cap - Red it has a square boreEnsure that you have the finest distributor cap available by using one of these Speedmaster distributor caps. They're designed with performance in mind, are molded from a high quality, voltage insulating material, and use low resistance terminals for maximum conductivity .