Amazing! I just started a restoration on a 65 Formula S car and was going to post the question "was an 8 3/4" option available for any of the late 65's. The car has an 8 3/4" 3.23 sure grip. No build sheet was with the car but the rear end has no indication that it has been changed. Springs are 6 leaf. All factory tags on the rear end are there. Does anyone know for sure if an 8 3/4" was available?