Wheel bolt pattern for original Dana 60 differential

Where is that information from?

From Bob Torozzi's the Chrysler Engineer who designed these cars original 1968 files on these cars.

The rear wheels were specifically spec'd out and custom ordered. 15x6 with 1.25" positive offset. Price for 300 wheels was $2500. available within 2 weeks (memo date 11/7/67). These were made from p/n 2823866