Right, but it doesn’t matter, you still have to figure out what you have, because it may not be right regardless of the year.
And to that end, I remembered that I have a ‘73 C-body spindle and brake caliper bracket set up, because it’s a 1 year only deal for C body brake conversions. And I have the pins, which are the same as the B/E body pins.
And I can confirm they are the same exact 3/8-24 that the 70-72 pins are advertised as.
Which leave us with, what threads do your caliper brackets have?