Another question I need help with on the 1966 mustang hipo fastback built in Dearborn on August 12, 1966 I am currently restoring. Which equalizer rod to clutch release leaver is correct for my car. I have two different ones. One is the C6ZZ-7521-E service part with an almost round mounting hole with flat area and the second one has a completely round mounting hole. Thanks for the help.