Thank you for looking, I agree it is all confusing & I expect once I find the answer I will be the oracle of DANA rear ends! This may however take a while as the parts I am looking for are now 70 to 60 years old. As you are a Studebaker man , do Studebaker six's have 12 port heads? Seven bearing crank? What capacity were the largest six's? My other project is a flatty six rod, looking for the best option.