These will fit either an automatic or 4-speed application. As you can see I had a spacer plate plasma cut then I welded it onto the thim manufacturers flange then die grinded out the opening to port match the exhaust of the head. i ran a 3" exhaust system so the outlets are for a slip fit application but can easliy be welded for a typical 3-bolt set-up. They were sand blasted then 2 coats of POR-15.